diff --git a/docs/DEPLOY.md b/docs/DEPLOY.md
index 41c8999..d83118c 100644
--- a/docs/DEPLOY.md
+++ b/docs/DEPLOY.md
@@ -75,6 +75,10 @@ web build 的 `VITE_API_BASE`、以及 Cloudflare Access application 的 domain
 
 ## 2. 建立 Cloudflare 資源（D1 / R2）
 
+> **R2 為選填。** 若不需要「成員上傳繳費截圖」，可跳過建立 R2，並移除 `wrangler.toml` 的 `[[r2_buckets]]` 區塊。
+> 未綁 R2 時停用：成員上傳/後台檢視繳費截圖、截圖自動保存清理；其餘（宣告繳費、後台審核、對帳、Discord 通知）一切正常。
+> 後台首次進入會跳一次提示，設定頁也會顯示「截圖儲存（R2）：未啟用」。
+
 ### 路徑一（後台操作）
 
 1. 進 [Cloudflare 後台](https://dash.cloudflare.com) → **Storage & Databases → D1**。
diff --git a/docs/superpowers/plans/2026-06-07-r2-optional.md b/docs/superpowers/plans/2026-06-07-r2-optional.md
new file mode 100644
index 0000000..a7b7528
--- /dev/null
+++ b/docs/superpowers/plans/2026-06-07-r2-optional.md
@@ -0,0 +1,621 @@
+# R2 改為選填 Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** 讓 Cloudflare R2 變成選填——未綁 R2 時截圖相關功能優雅停用，宣告繳費/審核/對帳/通知全照常；後端回報 R2 狀態，後台首次提示一次 + 設定頁常駐狀態。
+
+**Architecture:** 以 `!!env.BUCKET` 偵測 R2 是否設定（forker 不在 wrangler.toml 註冊 binding 即為未設定）。`src/env.ts` 的 `BUCKET` 改選填、4 處使用點加 runtime guard；`test/env.d.ts` 把測試用 `BUCKET` 覆寫為必填（測試環境一定有 R2，避免測試檔大量改動）。後端在 `/admin/workspace` 回 `r2_configured`、`/upload/:token` 回 `proof_enabled`，前端據此隱藏截圖 UI 並顯示提示/狀態。
+
+**Tech Stack:** Cloudflare Workers + R2 + D1，pnpm monorepo，TypeScript，Vitest（`@cloudflare/vitest-pool-workers`），React SPA（Vite）。
+
+**Spec:** `docs/superpowers/specs/2026-06-07-r2-optional-design.md`
+
+**前置：** 分支 `feat/r2-optional`（已建立，off main）。每個 Task 結束 commit。全程基準：`pnpm -r typecheck`、`pnpm --filter @chippot/worker test`、`pnpm -r build` 維持綠燈；worker 測試在「無 `.dev.vars`」下也須全綠（CI 條件）。
+
+---
+
+## File Structure
+
+| 檔案 | 責任 | Task |
+|---|---|---|
+| `packages/worker/src/env.ts` | `BUCKET?: R2Bucket`（選填） | 1 |
+| `packages/worker/test/env.d.ts` | 測試 env 覆寫 `BUCKET: R2Bucket`（必填） | 1 |
+| `packages/worker/src/core/storage.ts` | settle 存/補償 proof 加 `env.BUCKET` guard | 1 |
+| `packages/worker/src/routes/images.ts` | 無 BUCKET → 404 | 1 |
+| `packages/worker/src/core/retention.ts` | 無 BUCKET → 早退回 0 | 1 |
+| `packages/worker/src/routes/admin.ts` | deleteProof guard；getWorkspace 回 `r2_configured` | 1 |
+| `packages/worker/src/routes/upload.ts` | handleUploadInfo 回 `proof_enabled` | 1 |
+| worker 測試（settle/images/retention/admin/upload） | 無 R2 行為測試 | 1 |
+| `packages/worker/src/adapters/discord/handler.ts` | `/繳費` 無 R2 忽略附件 + 提示 | 2 |
+| `packages/worker/test/adapters/discord-pay.test.ts` | Discord 無 R2 測試 | 2 |
+| `packages/web/src/api.ts` + `App.tsx` | `proof_enabled` + 隱藏截圖欄位 | 3 |
+| `packages/admin/src/api.ts` + `App.tsx` + `views/Settings.tsx` | workspace 型別 + 首次提示 + 常駐狀態 | 4 |
+| `packages/worker/wrangler.toml` + `docs/DEPLOY.md` | R2 標選填 | 5 |
+
+---
+
+## Task 1: 後端 R2 選填（binding optional + guards + 偵測旗標）
+
+**Files:**
+- Modify: `packages/worker/src/env.ts`
+- Modify: `packages/worker/test/env.d.ts`
+- Modify: `packages/worker/src/core/storage.ts`
+- Modify: `packages/worker/src/routes/images.ts`
+- Modify: `packages/worker/src/core/retention.ts`
+- Modify: `packages/worker/src/routes/admin.ts`
+- Modify: `packages/worker/src/routes/upload.ts`
+- Test: `test/core/settle.test.ts`, `test/routes/images.test.ts`, `test/core/retention.test.ts`, `test/routes/admin.test.ts`, `test/routes/upload.test.ts`
+
+### Implementation
+
+- [ ] **Step 1: `env.ts` 把 BUCKET 改選填**
+
+`packages/worker/src/env.ts` 第 3 行 `  BUCKET: R2Bucket;` 改為：
+```ts
+  // Optional: omit the [[r2_buckets]] binding in wrangler.toml to run without screenshots.
+  BUCKET?: R2Bucket;
+```
+
+- [ ] **Step 2: `test/env.d.ts` 覆寫 BUCKET 為必填（測試環境一定有 R2）**
+
+`packages/worker/test/env.d.ts` 的 `interface Env extends AppEnv { ... }` 內，新增一行（覆寫 app 的選填為必填，讓既有測試直接存取 `env.BUCKET` 不報 TS 錯）：
+```ts
+    interface Env extends AppEnv {
+      TEST_MIGRATIONS: D1Migration[];
+      BUCKET: R2Bucket; // tests always provide R2; override the app's optional binding
+    }
+```
+
+- [ ] **Step 3: `storage.ts` 三處 guard**
+
+`packages/worker/src/core/storage.ts`，`settleUserPeriod` 內：
+
+(a) step 3 存 proof（約 186-190）：
+```ts
+  let key: string | null = null;
+  if (input.proof) {
+    key = buildScreenshotKey(workspaceId, period, userId, input.proof.ext, crypto.randomUUID());
+    await putObject(env.BUCKET, key, input.proof.body, input.proof.contentType);
+  }
+```
+改為（無 BUCKET 不存、key 維持 null、has_proof=0）：
+```ts
+  let key: string | null = null;
+  if (input.proof && env.BUCKET) {
+    key = buildScreenshotKey(workspaceId, period, userId, input.proof.ext, crypto.randomUUID());
+    await putObject(env.BUCKET, key, input.proof.body, input.proof.contentType);
+  }
+```
+
+(b) catch 補償（約 201）：`if (key) await deleteObject(env.BUCKET, key).catch(() => {});` → `if (key && env.BUCKET) await deleteObject(env.BUCKET, key).catch(() => {});`
+
+(c) TOCTOU 補償（約 218）：`if (paidRows.results.length === 0 && key) {` → `if (paidRows.results.length === 0 && key && env.BUCKET) {`
+
+> (b)(c) 的 key 只在 BUCKET 存在時才會非 null，加 `&& env.BUCKET` 純粹讓 TS 在選填型別下通過 narrowing。
+
+- [ ] **Step 4: `images.ts` 無 BUCKET → 404**
+
+`packages/worker/src/routes/images.ts`，在 `const obj = await env.BUCKET.get(key);`（約 24）之前插入：
+```ts
+  if (!env.BUCKET) return errorResponse(404, "not found");
+```
+
+- [ ] **Step 5: `retention.ts` 無 BUCKET → 早退**
+
+`packages/worker/src/core/retention.ts`，`runRetention` 函式體最前（`const cutoffIso = ...` 之前）插入：
+```ts
+  if (!env.BUCKET) return 0; // R2 not configured — nothing to retain
+```
+
+- [ ] **Step 6: `admin.ts` deleteProof guard + getWorkspace 回 r2_configured**
+
+`packages/worker/src/routes/admin.ts`：
+
+(a) `deleteProof`（約 459）：`if (p.screenshot_key) await env.BUCKET.delete(p.screenshot_key);` → `if (p.screenshot_key && env.BUCKET) await env.BUCKET.delete(p.screenshot_key);`
+
+(b) `getWorkspace`（約 52）：`return json({ workspace: { ...row, settings: parseSettings(row.settings) } });` → 
+```ts
+  return json({ workspace: { ...row, settings: parseSettings(row.settings) }, r2_configured: !!env.BUCKET });
+```
+
+- [ ] **Step 7: `upload.ts` handleUploadInfo 回 proof_enabled**
+
+`packages/worker/src/routes/upload.ts`，`handleUploadInfo` 的 `return json({...})`（約 22-28）加一欄：
+```ts
+  return json({
+    valid: true,
+    period: tok.period,
+    user: { display_name: user?.display_name ?? "" },
+    subscriptions,
+    channel_tags,
+    proof_enabled: !!env.BUCKET,
+  });
+```
+
+- [ ] **Step 8: typecheck（確認選填化 + guards 後 src 與 test 皆綠）**
+
+Run: `cd /Users/poterpan/Documents/Coding/Project/chippot && pnpm --filter @chippot/worker typecheck`
+Expected: 無錯（src 因 guards 通過；test 因 env.d.ts 覆寫通過）。
+
+### Tests
+
+- [ ] **Step 9: settle 無 R2 測試**
+
+`test/core/settle.test.ts`，在 `describe("settleUserPeriod — Discord direct path", ...)` 內新增：
+```ts
+  it("settles without a proof object when R2 is not configured (has_proof=0)", async () => {
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const r = await settleUserPeriod(env, {
+      workspaceId: WS, userId: WS, period: "2027-05", source: "user_slash",
+      proof: { body: new Uint8Array([1, 2, 3]), ext: "png", contentType: "image/png" },
+    });
+    (env as any).BUCKET = prev;
+    expect(r.paidCount).toBe(2);
+    expect(r.screenshotKey).toBeNull();
+    const rows = await env.DB.prepare("SELECT has_proof, screenshot_key FROM payments WHERE workspace_id=? AND period='2027-05'").bind(WS).all<{ has_proof: number; screenshot_key: string | null }>();
+    expect(rows.results.every((p) => p.has_proof === 0 && p.screenshot_key === null)).toBe(true);
+  });
+```
+
+- [ ] **Step 10: images 無 R2 測試**
+
+`test/routes/images.test.ts`，在 `describe("protected image endpoint", ...)` 內新增：
+```ts
+  it("404s when R2 is not configured", async () => {
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const res = await handleImage(new Request("https://x"), env, ctxFor(KEY));
+    (env as any).BUCKET = prev;
+    expect(res.status).toBe(404);
+  });
+```
+
+- [ ] **Step 11: retention 無 R2 測試**
+
+`test/core/retention.test.ts`，在 `describe("runRetention reference-counting", ...)` 內新增：
+```ts
+  it("is a no-op when R2 is not configured (returns 0, keeps the row + object)", async () => {
+    const KEY = "noR2-key-9023";
+    await env.DB.prepare(`INSERT INTO payments (workspace_id,subscription_id,period,period_start,period_end,due_date,amount,status,has_proof,screenshot_key,paid_at,source,created_at,updated_at) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?)`).bind(WS, SUB, "2023-05", "2023-05-01", "2023-05-31", "2023-05-05", 315, "verified", 1, KEY, OLD, "user_web", TS, TS).run();
+    await putObject(env.BUCKET, KEY, new Uint8Array([4]), "image/png");
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const cleared = await runRetention(env, WS, 24, NOW);
+    (env as any).BUCKET = prev;
+    expect(cleared).toBe(0);
+    const row = await env.DB.prepare("SELECT screenshot_key FROM payments WHERE workspace_id=? AND period='2023-05'").bind(WS).first<{ screenshot_key: string | null }>();
+    expect(row?.screenshot_key).toBe(KEY);
+    expect(await getObject(env.BUCKET, KEY)).not.toBeNull();
+  });
+```
+
+- [ ] **Step 12: admin getWorkspace + deleteProof 無 R2 測試**
+
+`test/routes/admin.test.ts`，在 `describe("admin API", ...)` 內新增兩個測試：
+```ts
+  it("reports r2_configured from the BUCKET binding", async () => {
+    const on = (await (await call("GET", "/admin/workspace"))!.json()) as any;
+    expect(on.r2_configured).toBe(true);
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const off = (await (await call("GET", "/admin/workspace"))!.json()) as any;
+    (env as any).BUCKET = prev;
+    expect(off.r2_configured).toBe(false);
+  });
+
+  it("delete-proof still clears the DB column when R2 is not configured", async () => {
+    const key = "1/2026-10/1/noR2.png";
+    const ins = await env.DB.prepare(
+      `INSERT INTO payments (workspace_id,subscription_id,period,period_start,period_end,due_date,amount,status,has_proof,screenshot_key,source,created_at,updated_at)
+       SELECT 1, s.id, '2026-10', '2026-10-01','2026-10-31','2026-10-05', 315, 'paid', 1, ?, 'user_web', ?, ?
+       FROM subscriptions s WHERE s.workspace_id = 1 ORDER BY s.id LIMIT 1`
+    ).bind(key, nowUtcIso(), nowUtcIso()).run();
+    const pid = ins.meta.last_row_id as number;
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const res = await call("POST", `/admin/payments/${pid}/delete-proof`);
+    (env as any).BUCKET = prev;
+    expect(res!.status).toBe(200);
+    const p = await getPayment(env.DB, pid);
+    expect(p?.screenshot_key).toBeNull();
+  });
+```
+
+- [ ] **Step 13: upload proof_enabled 測試**
+
+`test/routes/upload.test.ts`，在 `describe("upload info", ...)` 內新增：
+```ts
+  it("reports proof_enabled per R2 configuration", async () => {
+    const on = (await (await handleUploadInfo(new Request("https://x"), env, ctxFor(RAW_OK))).json()) as any;
+    expect(on.proof_enabled).toBe(true);
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const off = (await (await handleUploadInfo(new Request("https://x"), env, ctxFor(RAW_OK))).json()) as any;
+    (env as any).BUCKET = prev;
+    expect(off.proof_enabled).toBe(false);
+  });
+```
+
+- [ ] **Step 14: 跑全 worker 測試（含無 .dev.vars）**
+
+Run:
+```bash
+cd /Users/poterpan/Documents/Coding/Project/chippot
+mv packages/worker/.dev.vars packages/worker/.dev.vars.off 2>/dev/null; true
+pnpm --filter @chippot/worker test 2>&1 | grep -E "Test Files|Tests "
+mv packages/worker/.dev.vars.off packages/worker/.dev.vars 2>/dev/null; true
+```
+Expected: 全綠、無 failed。基數為合併後 main 的 161，本任務加 6 個測試 → `Tests 167 passed (167)`。ALWAYS restore .dev.vars。（若基數略有出入，以「全綠、無 failed」為準。）
+
+- [ ] **Step 15: Commit**
+```bash
+cd /Users/poterpan/Documents/Coding/Project/chippot
+git add packages/worker/src/env.ts packages/worker/test/env.d.ts packages/worker/src/core/storage.ts packages/worker/src/routes/images.ts packages/worker/src/core/retention.ts packages/worker/src/routes/admin.ts packages/worker/src/routes/upload.ts packages/worker/test
+git commit -m "feat(worker): make R2 optional — guard BUCKET usage + report status
+
+BUCKET becomes an optional binding; settle skips proof storage (has_proof=0),
+images 404, retention no-ops, delete-proof still clears the DB column when R2 is
+absent. /admin/workspace reports r2_configured and /upload/:token reports
+proof_enabled. Test env overrides BUCKET as required so existing tests are unaffected."
+```
+
+---
+
+## Task 2: Discord `/繳費` 無 R2 時忽略截圖 + 提示
+
+**Files:**
+- Modify: `packages/worker/src/adapters/discord/handler.ts`
+- Test: `packages/worker/test/adapters/discord-pay.test.ts`
+
+- [ ] **Step 1: 寫失敗測試**
+
+`packages/worker/test/adapters/discord-pay.test.ts`：把第 2 行 import 補上 `vi`：
+```ts
+import { beforeAll, describe, expect, it, vi } from "vitest";
+```
+在檔案末端新增 describe：
+```ts
+describe("/繳費 with no R2 ignores the screenshot", () => {
+  it("tells the member to use channel/note when only a screenshot is given and R2 is off", async () => {
+    const prevB = (env as any).BUCKET;
+    const prevApp = (env as any).DISCORD_APPLICATION_ID;
+    (env as any).BUCKET = undefined;
+    (env as any).DISCORD_APPLICATION_ID = "app-9024";
+    let captured = "";
+    vi.stubGlobal("fetch", vi.fn(async (_url: string, init: any) => { captured = JSON.parse(init.body).content; return new Response("{}", { status: 200 }); }));
+    const i: DiscordInteraction = {
+      type: 2, id: "1", token: "tok", guild_id: GUILD, ...member(DISC),
+      data: { name: "繳費", options: [{ name: "截圖", value: "att1" }], resolved: { attachments: { att1: { url: "https://cdn.discordapp.com/x.png", content_type: "image/png", size: 100 } } } },
+    } as any;
+    const res = await routeInteraction(i, env, CTX);
+    expect((await res.json() as any).type).toBe(5); // deferred
+    await Promise.all(tasks.splice(0));
+    vi.unstubAllGlobals();
+    (env as any).BUCKET = prevB;
+    (env as any).DISCORD_APPLICATION_ID = prevApp;
+    expect(captured).toContain("未開啟截圖功能");
+  });
+});
+```
+
+- [ ] **Step 2: 跑測試確認失敗**
+
+Run: `cd /Users/poterpan/Documents/Coding/Project/chippot && pnpm --filter @chippot/worker test test/adapters/discord-pay.test.ts 2>&1 | grep -E "未開啟|FAIL|Tests "`
+Expected: 失敗（目前無此訊息；附件在無 R2 時仍會嘗試下載/被忽略但無提示）。
+
+- [ ] **Step 3: 實作 handler 變更**
+
+`packages/worker/src/adapters/discord/handler.ts` 的 `computePayResult`，把「Optional screenshot」區塊（約 183-202）改為：
+```ts
+  // Optional screenshot — only when R2 is configured; otherwise ignore the attachment.
+  let proof: { body: ArrayBuffer; ext: string; contentType: string } | null = null;
+  const attachOpt = getOption(i, "截圖");
+  const attachment = attachOpt?.value ? i.data?.resolved?.attachments?.[attachOpt.value] : undefined;
+  const screenshotIgnored = !!attachment && !env.BUCKET;
+  if (attachment && env.BUCKET) {
+    const ct = attachment.content_type ?? "";
+    try { assertImageOk(ct, attachment.size ?? 0); }
+    catch (e) { if (e instanceof InvalidImage) return "截圖格式不支援或檔案過大，請改用備註或渠道。"; throw e; }
+    if (!isDiscordCdnUrl(attachment.url)) return "截圖來源無效。";
+    const res = await fetch(attachment.url);
+    if (!res.ok) return "下載截圖失敗，請稍後再試。";
+    const body = await res.arrayBuffer();
+    try { assertImageOk(ct, body.byteLength); } catch { return "截圖檔案過大。"; }
+    proof = { body, ext: extForContentType(ct), contentType: ct };
+  }
+
+  // At-least-one rule (slash): 渠道 / 截圖 / 備註.
+  if (!declaredChannelTagId && !proof && !note) {
+    if (screenshotIgnored) return "本站未開啟截圖功能，請改用「渠道」或「備註」登記繳費。";
+    return "請至少選擇「渠道」、附上「截圖」或填寫「備註」其中一項。";
+  }
+```
+並把成功訊息（約 209）：
+```ts
+  return `✅ 已登記本期（${period}）繳費 NT$${r.totalAmount.toLocaleString()}（共 ${r.paidCount} 筆）。管理員確認收款後完成。`;
+```
+改為：
+```ts
+  const ignoredNote = screenshotIgnored ? "（本站未開啟截圖功能，已記錄你的繳費宣告）" : "";
+  return `✅ 已登記本期（${period}）繳費 NT$${r.totalAmount.toLocaleString()}（共 ${r.paidCount} 筆）。管理員確認收款後完成。${ignoredNote}`;
+```
+
+- [ ] **Step 4: 跑測試確認通過（含無 .dev.vars）**
+
+Run:
+```bash
+cd /Users/poterpan/Documents/Coding/Project/chippot
+pnpm --filter @chippot/worker typecheck
+mv packages/worker/.dev.vars packages/worker/.dev.vars.off 2>/dev/null; true
+pnpm --filter @chippot/worker test 2>&1 | grep -E "Test Files|Tests "
+mv packages/worker/.dev.vars.off packages/worker/.dev.vars 2>/dev/null; true
+```
+Expected: typecheck 無錯；全綠、無 failed（167 + 1 → `Tests 168 passed (168)`）。
+
+- [ ] **Step 5: Commit**
+```bash
+cd /Users/poterpan/Documents/Coding/Project/chippot
+git add packages/worker/src/adapters/discord/handler.ts packages/worker/test/adapters/discord-pay.test.ts
+git commit -m "feat(discord): ignore /繳費 screenshot attachment when R2 is not configured
+
+Skip the attachment download when there's no R2 and tell the member to use channel/
+note (or append a note on success). The core storage guard already drops the proof;
+this avoids a wasted download and gives clear feedback."
+```
+
+---
+
+## Task 3: web 上傳頁依 proof_enabled 隱藏截圖
+
+**Files:**
+- Modify: `packages/web/src/api.ts`
+- Modify: `packages/web/src/App.tsx`
+
+- [ ] **Step 1: `api.ts` TokenInfo 加 proof_enabled**
+
+`packages/web/src/api.ts` 的 `TokenInfo` interface（約 14-20）加一欄：
+```ts
+export interface TokenInfo {
+  valid: boolean;
+  period?: string;
+  user?: { display_name: string };
+  subscriptions?: SubscriptionChoice[];
+  channel_tags?: ChannelTag[];
+  proof_enabled?: boolean;
+}
+```
+
+- [ ] **Step 2: `App.tsx` 隱藏截圖欄位 + 調整文案**
+
+`packages/web/src/App.tsx`：把截圖上傳區塊（`<label className={`drop ...`}> ... </label>`，約 126-143）包在條件內——僅當 `info.proof_enabled !== false` 時顯示：
+```tsx
+        {info.proof_enabled !== false && (
+        <label className={`drop ${preview ? "drop--has" : ""}`}>
+          <input
+            ref={fileRef}
+            type="file"
+            accept="image/png,image/jpeg,image/webp"
+            disabled={busy}
+            onChange={(e) => onPick(e.target.files?.[0] ?? null)}
+          />
+          {preview ? (
+            <img src={preview} alt="預覽" className="drop__img" />
+          ) : (
+            <div className="drop__hint">
+              <span className="drop__icon">＋</span>
+              <span>上傳繳費截圖（選填）</span>
+              <span className="muted small">PNG / JPG / WebP · 會自動壓縮</span>
+            </div>
+          )}
+        </label>
+        )}
+```
+並把底部說明（約 159）：
+```tsx
+        <p className="muted small center">渠道、截圖或備註至少填一項。此連結僅限你本人本期使用，送出後即失效。</p>
+```
+改為依 proof_enabled 切換文案：
+```tsx
+        <p className="muted small center">{info.proof_enabled === false ? "渠道或備註至少填一項。" : "渠道、截圖或備註至少填一項。"}此連結僅限你本人本期使用，送出後即失效。</p>
+```
+（`info` 在此 scope 為已驗證的 `TokenInfo`；若該段落用的變數名不同，依實際的 token-info 變數調整，但條件與文案如上。）
+
+> `submitPayment` 不需改：截圖欄位隱藏時 `file` 恆為 null，現有 `if (blob) fd.append(...)` 本就不會附截圖。
+
+- [ ] **Step 3: typecheck + build**
+
+Run:
+```bash
+cd /Users/poterpan/Documents/Coding/Project/chippot
+pnpm --filter @chippot/web typecheck && VITE_API_BASE=https://example.workers.dev pnpm --filter @chippot/web build 2>&1 | tail -2
+```
+Expected: 無錯、`✓ built`。
+
+- [ ] **Step 4: Commit**
+```bash
+cd /Users/poterpan/Documents/Coding/Project/chippot
+git add packages/web/src/api.ts packages/web/src/App.tsx
+git commit -m "feat(web): hide screenshot upload when R2 is disabled (proof_enabled)
+
+The upload page reads proof_enabled from the token info and hides the screenshot
+field + adjusts the helper copy when R2 is not configured; channel/note still work."
+```
+
+---
+
+## Task 4: admin 首次提示 + 設定頁常駐 R2 狀態
+
+**Files:**
+- Modify: `packages/admin/src/api.ts`
+- Modify: `packages/admin/src/App.tsx`
+- Modify: `packages/admin/src/views/Settings.tsx`
+
+- [ ] **Step 1: `api.ts` workspace() 型別加 r2_configured**
+
+`packages/admin/src/api.ts` 第 45 行 `workspace: () => req("GET", "/workspace"),` 改為：
+```ts
+  workspace: () => req<{ workspace: any; r2_configured: boolean }>("GET", "/workspace"),
+```
+
+- [ ] **Step 2: `App.tsx` 加一次性 R2 提示**
+
+`packages/admin/src/App.tsx`：在 import 區把 `api` 與 `Modal` 引入（目前未引入）：
+```ts
+import { api } from "./api";
+import { IconLogout } from "./ui";
+import { Modal } from "./ui";
+```
+（若 `./ui` 已在同一行 import，合併為 `import { IconLogout, Modal } from "./ui";`。）
+
+在 `export default function App()` 之外（檔案內）新增元件：
+```tsx
+function R2Notice() {
+  const [show, setShow] = useState(false);
+  useEffect(() => {
+    if (localStorage.getItem("chippot.r2NoticeSeen")) return;
+    api.workspace().then((w) => { if (w && w.r2_configured === false) setShow(true); }).catch(() => {});
+  }, []);
+  if (!show) return null;
+  const dismiss = () => { localStorage.setItem("chippot.r2NoticeSeen", "1"); setShow(false); };
+  return (
+    <Modal title="Cloudflare R2 尚未設定" onClose={dismiss}>
+      <p>偵測到尚未綁定 R2 儲存空間，以下功能將無法使用：</p>
+      <ul style={{ margin: "8px 0 8px 18px" }}>
+        <li>成員上傳繳費截圖</li>
+        <li>後台檢視繳費截圖</li>
+        <li>截圖自動保存清理</li>
+      </ul>
+      <p className="muted small">不影響：宣告繳費、後台審核、對帳、Discord 通知。如需截圖功能，請在 wrangler.toml 註冊 R2 binding 後重新部署。</p>
+      <button className="btn btn--primary" onClick={dismiss}>我知道了</button>
+    </Modal>
+  );
+}
+```
+在 App 的 `return ( <div className="app"> ... </div> )` 內最上方插入 `<R2Notice />`（例如緊接 `<div className="app">` 之後）：
+```tsx
+  return (
+    <div className="app">
+      <R2Notice />
+      <aside className="sidebar">
+```
+
+- [ ] **Step 3: `Settings.tsx` 加常駐 R2 狀態列**
+
+`packages/admin/src/views/Settings.tsx`：把第 3 行 import 補上 `IconCheck, IconWarning`：
+```ts
+import { useAsync, Card, Field, Empty, Modal, IconCheck, IconWarning } from "../ui";
+```
+在 render 的 `{saved && ...}`（約 109）之後、`<Field label="統一結帳日 ...`（約 110）之前插入狀態列：
+```tsx
+        {data && (
+          <div style={{ marginBottom: 14, fontSize: 14 }}>
+            <span className="field__label">截圖儲存（R2）：</span>{" "}
+            {(data as any).r2_configured
+              ? <span style={{ color: "var(--teal)" }}><IconCheck /> 已啟用</span>
+              : <span style={{ color: "var(--muted)" }}><IconWarning /> 未啟用（成員無法上傳截圖；其餘功能正常）</span>}
+          </div>
+        )}
+```
+
+- [ ] **Step 4: typecheck + build**
+
+Run:
+```bash
+cd /Users/poterpan/Documents/Coding/Project/chippot
+pnpm --filter @chippot/admin typecheck && pnpm --filter @chippot/admin build 2>&1 | tail -2
+```
+Expected: 無錯、`✓ built`。
+
+- [ ] **Step 5: Commit**
+```bash
+cd /Users/poterpan/Documents/Coding/Project/chippot
+git add packages/admin/src/api.ts packages/admin/src/App.tsx packages/admin/src/views/Settings.tsx
+git commit -m "feat(admin): one-time R2 notice + persistent R2 status row
+
+When the worker reports r2_configured=false, show a one-time (localStorage) modal
+listing the disabled screenshot features, and a persistent status row in Settings."
+```
+
+---
+
+## Task 5: DEPLOY.md 標 R2 選填（subagent）
+
+**Files:**
+- Modify: `docs/DEPLOY.md`
+
+> ⚠️ **不要碰 `packages/worker/wrangler.toml`。** 該檔被 `git update-index --skip-worktree` 保護、本機是 owner 真實值；任何 `git add` 都可能把真實值 commit 進公開 repo（外洩）。`wrangler.toml` 的「R2 選填」註解由 **controller** 在收尾時用 skip-worktree dance 安全處理（見計畫末「Controller-only step」），**不在本任務範圍**。
+
+- [ ] **Step 1: `docs/DEPLOY.md` R2 標選填**
+
+在 `docs/DEPLOY.md` 第 2 節「建立 Cloudflare 資源（D1 / R2）」中，R2 建立步驟標為**選填**，並加一句說明。找到 R2 相關行（建立 R2 bucket 的指令/敘述），在其前後加註：
+```
+> R2 為**選填**：若不需要成員上傳繳費截圖，可跳過建立 R2、並移除 wrangler.toml 的 [[r2_buckets]] 區塊。
+> 未綁 R2 時，以下功能停用——成員上傳/後台檢視繳費截圖、截圖自動保存清理；其餘（宣告繳費、審核、對帳、通知）正常。
+> 後台首次進入會提示 R2 未設定，設定頁也會顯示「截圖儲存（R2）：未啟用」。
+```
+（具體插入點：第 2 節 R2 段落；保持與該節既有 zh-TW 風格一致。）
+
+- [ ] **Step 2: 確認 DEPLOY.md 無 owner 值，且未動到 wrangler.toml**
+
+Run:
+```bash
+cd /Users/poterpan/Documents/Coding/Project/chippot
+grep -n "panspace\|poterpan5466" docs/DEPLOY.md || echo "(DEPLOY.md clean)"
+git status --porcelain
+```
+Expected: `(DEPLOY.md clean)`；`git status` 只顯示 `docs/DEPLOY.md`（**不得**出現 `packages/worker/wrangler.toml`）。
+
+- [ ] **Step 3: Commit（只 DEPLOY.md）**
+```bash
+cd /Users/poterpan/Documents/Coding/Project/chippot
+git add docs/DEPLOY.md
+git commit -m "docs(deploy): mark R2 as optional
+
+Document that skipping R2 (omit the [[r2_buckets]] binding) runs the system without
+screenshot upload/view/retention; everything else works. Note the admin one-time
+prompt + the persistent status row."
+```
+
+---
+
+## Controller-only step（收尾：wrangler.toml 加 R2 選填註解，安全處理 skip-worktree）
+
+> 由 controller（持有 owner 真實值）在所有 subagent task 完成後執行。`packages/worker/wrangler.toml` 被 skip-worktree、本機為真實值；必須避免把真實值 commit。安全程序：
+> 1. `cp packages/worker/wrangler.toml /tmp/wrangler.local.toml`（備份本機真實值）
+> 2. `git update-index --no-skip-worktree packages/worker/wrangler.toml`
+> 3. `git checkout HEAD -- packages/worker/wrangler.toml`（工作檔還原為**已提交的佔位值版**）
+> 4. 在佔位值版的 `[[r2_buckets]]` 區塊上方加註解「選填：不需要成員上傳截圖可移除此區塊…」
+> 5. `git add packages/worker/wrangler.toml && git commit`（提交＝佔位值+註解，無真實值）
+> 6. `cp /tmp/wrangler.local.toml packages/worker/wrangler.toml`（還原本機真實值）
+> 7. `git update-index --skip-worktree packages/worker/wrangler.toml`（重設保護）
+> 8. 驗證：`git show HEAD:packages/worker/wrangler.toml | grep -E "選填|your-d1-database-id"`（提交版有註解且仍佔位）；`git status --porcelain`（乾淨，skip-worktree 隱藏本機真實值）。
+
+---
+
+## Final verification（全部 Task 完成後）
+
+- [ ] **Step 1: 全 monorepo 綠燈（無 .dev.vars = CI 條件）**
+
+Run:
+```bash
+cd /Users/poterpan/Documents/Coding/Project/chippot
+mv packages/worker/.dev.vars packages/worker/.dev.vars.off 2>/dev/null; true
+pnpm -r typecheck && pnpm -r test 2>&1 | grep -E "Test Files|Tests " && VITE_API_BASE=https://example.workers.dev pnpm -r build 2>&1 | grep -cE "built in"
+mv packages/worker/.dev.vars.off packages/worker/.dev.vars 2>/dev/null; true
+```
+Expected: typecheck 全過；全綠無 failed（`Tests 168 passed (168)`）；build 計數 2（web+admin）。
+
+---
+
+## Self-Review 對照（spec → task）
+
+- spec §3 + §4A（BUCKET 選填 + storage/images/retention/deleteProof guard） → Task 1 ✓
+- spec §4A（getWorkspace r2_configured、upload proof_enabled） → Task 1 ✓
+- spec §4B（web 隱藏截圖） → Task 3 ✓
+- spec §4B（Discord 忽略附件 + 提示） → Task 2 ✓
+- spec §4C（後台首次 localStorage 提示） → Task 4 ✓
+- spec §4D（設定頁常駐狀態） → Task 4 ✓
+- spec §4E（wrangler.toml 選填註解 + DEPLOY.md） → Task 5 ✓
+- spec §6（測試：settle/images/retention/getWorkspace/proof_enabled/deleteProof） → Task 1 測試 ✓；Discord → Task 2 ✓
+- 型別：`r2_configured`（getWorkspace/admin api）、`proof_enabled`（upload/web TokenInfo）名稱跨 task 一致 ✓
diff --git a/docs/superpowers/specs/2026-06-07-r2-optional-design.md b/docs/superpowers/specs/2026-06-07-r2-optional-design.md
new file mode 100644
index 0000000..60de861
--- /dev/null
+++ b/docs/superpowers/specs/2026-06-07-r2-optional-design.md
@@ -0,0 +1,105 @@
+# R2 改為選填 — 設計
+
+> 日期：2026-06-07　狀態：設計定稿，待寫實作計畫
+> 功能 1（兩個體驗優化之一；功能 2「成員/訂閱刪除 CRUD」另立 spec）
+
+## 1. 背景與目標
+
+有些部署者不需要「成員上傳繳費截圖」功能，因此不想註冊 Cloudflare R2。目前 `env.BUCKET`
+（R2 binding）是**必填**，程式多處直接使用，未綁 R2 會壞。目標：
+
+1. **R2 變選填**：不註冊 R2 binding 時，整個系統照常運作，只有「截圖佐證」相關功能優雅停用。
+2. **後台首次提示**：未設定 R2 時，管理者第一次進後台彈一次提示，說明哪些功能不可用（只彈一次）。
+3. **常駐狀態**：設定頁顯示一個常駐的「截圖儲存：未啟用 / 已啟用」狀態，方便日後查看。
+
+**宣告繳費本身不受影響**：選渠道、填備註、後台審核（verify/reject/改金額）、對帳、Discord 開繳/催繳全部照常。
+
+## 2. 關鍵設計決策
+
+- **偵測方式＝binding 是否存在**（`!!env.BUCKET`），不另設 workspace 開關。R2 是基礎設施設定，
+  forker 不在 `wrangler.toml` 註冊 `[[r2_buckets]]` 即視為未啟用；零額外狀態、不會「設定說有但實際沒綁」矛盾。
+- **無 R2 時截圖一律隱藏/忽略**（成員端），既有「宣告繳費」路徑全程可用。
+- **首次提示用 localStorage**（admin SPA 目前未用 localStorage）；只彈一次。
+
+## 3. R2 依賴點與停用後行為
+
+`env.BUCKET` 目前 4 處使用 → 改 `BUCKET?: R2Bucket`（選填）並逐處 guard：
+
+| 位置 | 現行 | 無 R2 時 |
+|---|---|---|
+| `core/storage.ts` `settleUserPeriod` step 3（存 proof） | `putObject(env.BUCKET, …)` | 有 proof 也跳過儲存，付款宣告照常寫入（`has_proof=0`、`screenshot_key=NULL`），不報錯 |
+| `routes/images.ts`（看截圖） | `env.BUCKET.get(key)` | 回 404（截圖功能停用） |
+| `routes/admin.ts` `deleteProof` | `env.BUCKET.delete(key)` | 無 BUCKET 或無 proof → 安全 no-op（仍清 DB 欄位） |
+| `core/retention.ts`（cron） | `env.BUCKET.delete(...)` | 整段跳過、回 0 |
+
+> `storage.ts` 的 `deleteObject` 補償清理（:201、:219）也在 `if (key)` 內，key 為 null 時自然略過；
+> 但因 step 3 已 guard，無 R2 時 key 恆為 null。
+
+## 4. 元件設計
+
+### A. 後端偵測旗標
+- `env.ts`：`BUCKET?: R2Bucket`。
+- `routes/admin.ts` `getWorkspace`：回應由 `{ workspace }` 擴充為 `{ workspace, r2_configured: !!env.BUCKET }`。
+- `routes/upload.ts` `handleUploadInfo`（`GET /upload/:token`）：回應加 `proof_enabled: !!env.BUCKET`。
+
+### B. 成員端截圖 UX
+- **web 上傳頁**（`packages/web`）：`TokenInfo` 型別加 `proof_enabled?: boolean`；`App.tsx` 依此**隱藏截圖欄位與相關說明**，只留渠道+備註。`api.ts` 的 `submitPayment` 在停用時不附 `screenshot`。
+- **Discord `/繳費`**（`adapters/discord/handler.ts`）：附了截圖但無 R2 → 不傳 proof 給 `settleUserPeriod`（或傳了也被 storage guard 跳過），ephemeral 回覆加一句「本站未開啟截圖功能，已記錄你的繳費宣告」。
+- **core 防線**：`settleUserPeriod` step 3 改為 `if (input.proof && env.BUCKET)` 才 `putObject`；這是無論前端如何都成立的單一真相 guard。
+
+### C. 後台首次提示（功能 1b/1c）
+- admin SPA 頂層（`App.tsx`）載入後：若 `r2_configured===false` 且 `localStorage.getItem("chippot.r2NoticeSeen")` 不存在 → 顯示一次 Modal。
+- Modal 內容：標題「Cloudflare R2 尚未設定」；說明停用的功能（成員上傳/檢視繳費截圖、截圖自動保存清理）；一句「不影響：宣告繳費、後台審核、對帳、Discord 通知」；關閉鈕。
+- 關閉時 `localStorage.setItem("chippot.r2NoticeSeen", "1")`，不再彈。
+
+### D. 常駐狀態（功能採納項）
+- 設定頁（`views/Settings.tsx`）新增一行常駐狀態：**截圖儲存（R2）：✅ 已啟用 / ⚠️ 未啟用**，由 `api.workspace()` 回的 `r2_configured` 驅動。未啟用時附一句「成員無法上傳截圖；其餘功能正常」。
+
+### E. 設定 / 文件
+- `wrangler.toml`：`[[r2_buckets]]` 區塊上方加註解「選填：不需要成員上傳截圖可移除此區塊（R2 未綁時截圖功能自動停用）」。
+- `docs/DEPLOY.md`：第 2 節 R2 標為**選填**；新增說明「移除 R2 binding 後，成員上傳/檢視截圖與保存清理停用，其餘照常」。
+
+## 5. 介面 / 檔案異動清單
+
+| 檔案 | 異動 |
+|---|---|
+| `packages/worker/src/env.ts` | `BUCKET?: R2Bucket`（選填） |
+| `packages/worker/src/core/storage.ts` | `settleUserPeriod` step 3 存 proof 加 `&& env.BUCKET` guard |
+| `packages/worker/src/routes/images.ts` | 無 BUCKET → 404 |
+| `packages/worker/src/routes/admin.ts` | `deleteProof` guard；`getWorkspace` 回 `r2_configured` |
+| `packages/worker/src/core/retention.ts` | 無 BUCKET → 跳過、回 0 |
+| `packages/worker/src/routes/upload.ts` | `handleUploadInfo` 回 `proof_enabled` |
+| `packages/worker/src/adapters/discord/handler.ts` | `/繳費` 無 R2 時忽略附件 + 提示 |
+| `packages/web/src/api.ts` | `TokenInfo.proof_enabled`；`submitPayment` 停用時不附截圖 |
+| `packages/web/src/App.tsx` | 依 `proof_enabled` 隱藏截圖欄位 |
+| `packages/admin/src/api.ts` | `workspace()` 回傳型別加 `r2_configured` |
+| `packages/admin/src/App.tsx` | 首次 R2 提示 Modal（localStorage 一次性） |
+| `packages/admin/src/views/Settings.tsx` | 常駐 R2 狀態列 |
+| `packages/worker/wrangler.toml` | `[[r2_buckets]]` 加「選填」註解 |
+| `docs/DEPLOY.md` | R2 標選填 + 停用功能說明 |
+
+## 6. 測試
+
+既有 R2 測試不受影響（vitest 測試環境仍提供 BUCKET binding）。新增（以 `(env as any).BUCKET = undefined` 模擬未綁）：
+- `settleUserPeriod`：附 proof 但無 BUCKET → 仍成功結算、`has_proof=0`、`screenshot_key=NULL`、不丟例外。
+- `images` 路由：無 BUCKET → 404。
+- `retention`：無 BUCKET → 回 0、不呼叫刪除。
+- `GET /admin/workspace`：回 `r2_configured`（有 BUCKET=true）；模擬無 BUCKET=false。
+- `GET /upload/:token`：回 `proof_enabled` 對應 BUCKET 有無。
+- `deleteProof`：無 BUCKET → 仍清 DB 欄位、不丟例外。
+
+> 注意：vitest pool 的 BUCKET 來自設定；逐測試以 save/restore `(env as any).BUCKET` 模擬未綁（沿用既有 token save/restore 範式），避免污染其他測試。
+
+## 7. 風險與權衡
+
+- **既有截圖資料**：本變更只影響「未綁 R2」的部署；已綁 R2 者行為完全不變。
+- **Discord slash option**：`/繳費` 的「截圖」option 是靜態註冊、無法依 R2 動態隱藏，故採「忽略附件 + 提示」而非隱藏（已於 §4B 說明）。
+- **localStorage 一次性**：清掉瀏覽器儲存會再彈一次；可接受（符合「首次提示」語意）。常駐狀態列提供長期可見性。
+
+## 8. 決議摘要（brainstorming）
+
+1. 偵測：**binding-absence**（`!!env.BUCKET`），不另設開關。
+2. 成員截圖：**隱藏/忽略**，宣告繳費照常。
+3. 首次提示：**localStorage 一次性 Modal**。
+4. **加常駐 R2 狀態列**於設定頁。
+5. 與「成員/訂閱刪除 CRUD」分為**兩份獨立 spec/PR**；本 spec 為功能 1。
diff --git a/packages/admin/src/App.tsx b/packages/admin/src/App.tsx
index 4c8c6b8..6d1e839 100644
--- a/packages/admin/src/App.tsx
+++ b/packages/admin/src/App.tsx
@@ -3,7 +3,8 @@ import { Dashboard } from "./views/Dashboard";
 import { Payments } from "./views/Payments";
 import { Users, Subscriptions, Plans, ChannelTags } from "./views/Manage";
 import { Settings } from "./views/Settings";
-import { IconLogout } from "./ui";
+import { api } from "./api";
+import { IconLogout, Modal } from "./ui";
 
 const VIEWS = [
   { id: "dashboard", label: "對帳看板", el: <Dashboard /> },
@@ -15,6 +16,28 @@ const VIEWS = [
   { id: "settings", label: "設定", el: <Settings /> },
 ];
 
+function R2Notice() {
+  const [show, setShow] = useState(false);
+  useEffect(() => {
+    if (localStorage.getItem("chippot.r2NoticeSeen")) return;
+    api.workspace().then((w) => { if (w && w.r2_configured === false) setShow(true); }).catch(() => {});
+  }, []);
+  if (!show) return null;
+  const dismiss = () => { localStorage.setItem("chippot.r2NoticeSeen", "1"); setShow(false); };
+  return (
+    <Modal title="Cloudflare R2 尚未設定" onClose={dismiss}>
+      <p>偵測到尚未綁定 R2 儲存空間，以下功能將無法使用：</p>
+      <ul style={{ margin: "8px 0 8px 18px" }}>
+        <li>成員上傳繳費截圖</li>
+        <li>後台檢視繳費截圖</li>
+        <li>截圖自動保存清理</li>
+      </ul>
+      <p className="muted small">不影響：宣告繳費、後台審核、對帳、Discord 通知。如需截圖功能，請在 wrangler.toml 註冊 R2 binding 後重新部署。</p>
+      <button className="btn btn--primary" onClick={dismiss}>我知道了</button>
+    </Modal>
+  );
+}
+
 export default function App() {
   const [view, setView] = useState(() => window.location.hash.slice(1) || "dashboard");
   useEffect(() => {
@@ -26,6 +49,7 @@ export default function App() {
 
   return (
     <div className="app">
+      <R2Notice />
       <aside className="sidebar">
         <div className="sidebar__brand">ChipPot</div>
         <nav className="nav">
diff --git a/packages/admin/src/api.ts b/packages/admin/src/api.ts
index e790175..6602876 100644
--- a/packages/admin/src/api.ts
+++ b/packages/admin/src/api.ts
@@ -42,7 +42,7 @@ export interface User { id: number; display_name: string; discord_id: string | n
 export interface Subscription { id: number; user_name: string; plan_name: string; status: string; start_date: string; billing_day: number; custom_cycle: number; user_id: number; plan_id: number }
 
 export const api = {
-  workspace: () => req("GET", "/workspace"),
+  workspace: () => req<{ workspace: any; r2_configured: boolean }>("GET", "/workspace"),
   updateWorkspace: (b: unknown) => req("PATCH", "/workspace", b),
   rebuildPaymentMessage: () => req<{ message_id: string }>("POST", "/discord/payment-message"),
   registerCommands: () => req<{ ok: boolean; registered: number }>("POST", "/discord/register-commands"),
diff --git a/packages/admin/src/views/Settings.tsx b/packages/admin/src/views/Settings.tsx
index 787d806..f7d5900 100644
--- a/packages/admin/src/views/Settings.tsx
+++ b/packages/admin/src/views/Settings.tsx
@@ -1,6 +1,6 @@
 import { useEffect, useState } from "react";
 import { api, currentPeriod, nextBillingPeriod } from "../api";
-import { useAsync, Card, Field, Empty, Modal } from "../ui";
+import { useAsync, Card, Field, Empty, Modal, IconCheck, IconWarning } from "../ui";
 
 const PLACEHOLDER_RE = /\{(\w+)\}/g;
 const OVERDUE_KEYS = ["period", "count", "list"];
@@ -107,6 +107,14 @@ export function Settings() {
       <div style={{ padding: "18px 20px", maxWidth: 460 }}>
         {err && <div className="error-banner">{err}</div>}
         {saved && <div style={{ color: "var(--teal)", marginBottom: 12 }}>✓ 已儲存</div>}
+        {data && (
+          <div style={{ marginBottom: 14, fontSize: 14 }}>
+            <span className="field__label">截圖儲存（R2）：</span>{" "}
+            {(data as any).r2_configured
+              ? <span style={{ color: "var(--teal)" }}><IconCheck /> 已啟用</span>
+              : <span style={{ color: "var(--muted)" }}><IconWarning /> 未啟用（成員無法上傳截圖；其餘功能正常）</span>}
+          </div>
+        )}
         <Field label="統一結帳日 (1-28)"><input type="number" value={billingDay} onChange={(e) => setBillingDay(e.target.value)} disabled={busy} /></Field>
         <Field label="逾期天數"><input type="number" value={overdue} onChange={(e) => setOverdue(e.target.value)} disabled={busy} /></Field>
         <Field label="截圖保存月數 (retention)"><input type="number" value={retention} onChange={(e) => setRetention(e.target.value)} disabled={busy} /></Field>
diff --git a/packages/web/src/App.tsx b/packages/web/src/App.tsx
index 8f1bec2..1b5bdb2 100644
--- a/packages/web/src/App.tsx
+++ b/packages/web/src/App.tsx
@@ -123,6 +123,7 @@ export default function App() {
           </label>
         )}
 
+        {info?.proof_enabled !== false && (
         <label className={`drop ${preview ? "drop--has" : ""}`}>
           <input
             ref={fileRef}
@@ -141,6 +142,7 @@ export default function App() {
             </div>
           )}
         </label>
+        )}
 
         <textarea
           className="note"
@@ -156,7 +158,7 @@ export default function App() {
         <button className="submit" onClick={submit} disabled={busy || !canSubmit}>
           {busy ? "上傳中…" : "送出繳費"}
         </button>
-        <p className="muted small center">渠道、截圖或備註至少填一項。此連結僅限你本人本期使用，送出後即失效。</p>
+        <p className="muted small center">{info?.proof_enabled === false ? "渠道或備註至少填一項。" : "渠道、截圖或備註至少填一項。"}此連結僅限你本人本期使用，送出後即失效。</p>
       </div>
     </Shell>
   );
diff --git a/packages/web/src/api.ts b/packages/web/src/api.ts
index 228beaf..719548f 100644
--- a/packages/web/src/api.ts
+++ b/packages/web/src/api.ts
@@ -23,6 +23,7 @@ export interface TokenInfo {
   user?: { display_name: string };
   subscriptions?: SubscriptionChoice[];
   channel_tags?: ChannelTag[];
+  proof_enabled?: boolean;
 }
 
 export async function fetchTokenInfo(token: string): Promise<TokenInfo> {
diff --git a/packages/worker/src/adapters/discord/handler.ts b/packages/worker/src/adapters/discord/handler.ts
index 3431220..66db31e 100644
--- a/packages/worker/src/adapters/discord/handler.ts
+++ b/packages/worker/src/adapters/discord/handler.ts
@@ -180,11 +180,12 @@ async function computePayResult(i: DiscordInteraction, env: Env): Promise<string
     declaredChannelTagId = tagId;
   }
 
-  // Optional screenshot.
+  // Optional screenshot — only when R2 is configured; otherwise ignore the attachment.
   let proof: { body: ArrayBuffer; ext: string; contentType: string } | null = null;
   const attachOpt = getOption(i, "截圖");
   const attachment = attachOpt?.value ? i.data?.resolved?.attachments?.[attachOpt.value] : undefined;
-  if (attachment) {
+  const screenshotIgnored = !!attachment && !env.BUCKET;
+  if (attachment && env.BUCKET) {
     const ct = attachment.content_type ?? "";
     try { assertImageOk(ct, attachment.size ?? 0); }
     catch (e) { if (e instanceof InvalidImage) return "截圖格式不支援或檔案過大，請改用備註或渠道。"; throw e; }
@@ -198,6 +199,7 @@ async function computePayResult(i: DiscordInteraction, env: Env): Promise<string
 
   // At-least-one rule (slash): 渠道 / 截圖 / 備註.
   if (!declaredChannelTagId && !proof && !note) {
+    if (screenshotIgnored) return "本站未開啟截圖功能，請改用「渠道」或「備註」登記繳費。";
     return "請至少選擇「渠道」、附上「截圖」或填寫「備註」其中一項。";
   }
 
@@ -206,7 +208,8 @@ async function computePayResult(i: DiscordInteraction, env: Env): Promise<string
     declaredChannelTagId, paymentNote: note, proof,
   });
   if (r.paidCount === 0) return `本期（${period}）已登記繳費，無需重複操作。`;
-  return `✅ 已登記本期（${period}）繳費 NT$${r.totalAmount.toLocaleString()}（共 ${r.paidCount} 筆）。管理員確認收款後完成。`;
+  const ignoredNote = screenshotIgnored ? "（本站未開啟截圖功能，已記錄你的繳費宣告）" : "";
+  return `✅ 已登記本期（${period}）繳費 NT$${r.totalAmount.toLocaleString()}（共 ${r.paidCount} 筆）。管理員確認收款後完成。${ignoredNote}`;
 }
 
 // ── 發起繳費 (admin): modal open + modal submit ──────────────────────────────
diff --git a/packages/worker/src/core/retention.ts b/packages/worker/src/core/retention.ts
index cd73b83..f586de2 100644
--- a/packages/worker/src/core/retention.ts
+++ b/packages/worker/src/core/retention.ts
@@ -29,6 +29,7 @@ export async function runRetention(
   retentionMonths: number,
   now: Date = new Date()
 ): Promise<number> {
+  if (!env.BUCKET) return 0; // R2 not configured — nothing to retain
   const cutoffIso = subMonthsUtc(now, retentionMonths).toISOString();
 
   const { results } = await env.DB
diff --git a/packages/worker/src/core/storage.ts b/packages/worker/src/core/storage.ts
index f5abada..d964cc2 100644
--- a/packages/worker/src/core/storage.ts
+++ b/packages/worker/src/core/storage.ts
@@ -184,7 +184,7 @@ export async function settleUserPeriod(env: Env, input: SettleInput): Promise<Se
 
   // 3. Store the proof once (shared key) if present.
   let key: string | null = null;
-  if (input.proof) {
+  if (input.proof && env.BUCKET) {
     key = buildScreenshotKey(workspaceId, period, userId, input.proof.ext, crypto.randomUUID());
     await putObject(env.BUCKET, key, input.proof.body, input.proof.contentType);
   }
@@ -198,7 +198,7 @@ export async function settleUserPeriod(env: Env, input: SettleInput): Promise<Se
       await applyDirectSettle(env, input, key, now);
     }
   } catch (err) {
-    if (key) await deleteObject(env.BUCKET, key).catch(() => {});
+    if (key && env.BUCKET) await deleteObject(env.BUCKET, key).catch(() => {});
     throw err;
   }
 
@@ -215,7 +215,7 @@ export async function settleUserPeriod(env: Env, input: SettleInput): Promise<Se
   // TOCTOU guard: if a concurrent settle paid these rows between the settleTargets() snapshot
   // and our UPDATE, the direct path can match 0 rows after we already stored the object —
   // compensate so it isn't orphaned. (The token path throws before reaching here on 0 rows.)
-  if (paidRows.results.length === 0 && key) {
+  if (paidRows.results.length === 0 && key && env.BUCKET) {
     await deleteObject(env.BUCKET, key).catch(() => {});
     key = null;
   }
diff --git a/packages/worker/src/env.ts b/packages/worker/src/env.ts
index 5cbf3e5..993e55f 100644
--- a/packages/worker/src/env.ts
+++ b/packages/worker/src/env.ts
@@ -1,6 +1,7 @@
 export interface Env {
   DB: D1Database;
-  BUCKET: R2Bucket;
+  // Optional: omit the [[r2_buckets]] binding in wrangler.toml to run without screenshots.
+  BUCKET?: R2Bucket;
   // Cloudflare Access (secrets / vars; set via wrangler secret put or .dev.vars).
   ACCESS_TEAM_DOMAIN?: string; // <team> in <team>.cloudflareaccess.com
   ACCESS_AUD?: string; // Access application AUD tag
diff --git a/packages/worker/src/routes/admin.ts b/packages/worker/src/routes/admin.ts
index 97ca723..7ecb0d4 100644
--- a/packages/worker/src/routes/admin.ts
+++ b/packages/worker/src/routes/admin.ts
@@ -49,7 +49,7 @@ async function getWorkspace(_req: Request, env: Env, ctx: RouteCtx): Promise<Res
   const row = await env.DB.prepare("SELECT * FROM workspaces WHERE id = ?").bind(wsId(ctx))
     .first<{ id: number; name: string; billing_day: number; settings: string }>();
   if (!row) return errorResponse(404, "not found");
-  return json({ workspace: { ...row, settings: parseSettings(row.settings) } });
+  return json({ workspace: { ...row, settings: parseSettings(row.settings) }, r2_configured: !!env.BUCKET });
 }
 
 async function updateWorkspace(req: Request, env: Env, ctx: RouteCtx): Promise<Response> {
@@ -456,7 +456,7 @@ async function deleteProof(_req: Request, env: Env, ctx: RouteCtx): Promise<Resp
   const id = Number(ctx.params.id);
   const p = await getPayment(env.DB, id);
   if (!p) return errorResponse(404, "not found");
-  if (p.screenshot_key) await env.BUCKET.delete(p.screenshot_key);
+  if (p.screenshot_key && env.BUCKET) await env.BUCKET.delete(p.screenshot_key);
   await env.DB.prepare("UPDATE payments SET screenshot_key = NULL, proof_deleted_at = ?, updated_at = ? WHERE id = ?")
     .bind(taipeiDate(), nowUtcIso(), id).run();
   await writeAudit(env.DB, { workspaceId: p.workspace_id, actor: actorOf(ctx), action: "proof.delete", entityType: "payment", entityId: id, before: { screenshot_key: p.screenshot_key } });
diff --git a/packages/worker/src/routes/images.ts b/packages/worker/src/routes/images.ts
index efe2a6f..4eee3ee 100644
--- a/packages/worker/src/routes/images.ts
+++ b/packages/worker/src/routes/images.ts
@@ -15,6 +15,8 @@ export async function handleImage(
   const key = ctx.url.searchParams.get("key");
   if (!key) return errorResponse(400, "key is required");
 
+  if (!env.BUCKET) return errorResponse(404, "not found");
+
   const known = await env.DB
     .prepare("SELECT 1 AS ok FROM payments WHERE screenshot_key = ?")
     .bind(key)
diff --git a/packages/worker/src/routes/upload.ts b/packages/worker/src/routes/upload.ts
index 39be675..7238c14 100644
--- a/packages/worker/src/routes/upload.ts
+++ b/packages/worker/src/routes/upload.ts
@@ -25,6 +25,7 @@ export async function handleUploadInfo(_req: Request, env: Env, ctx: RouteCtx):
     user: { display_name: user?.display_name ?? "" },
     subscriptions,
     channel_tags,
+    proof_enabled: !!env.BUCKET,
   });
 }
 
@@ -70,7 +71,7 @@ export async function handleUpload(req: Request, env: Env, ctx: RouteCtx): Promi
       workspaceId: tok.workspace_id, userId: tok.user_id, period: tok.period,
       source: "user_web", tokenHash: hash, declaredChannelTagId, paymentNote: note, proof,
     });
-    return json({ ok: true, paid_count: r.paidCount, total_amount: r.totalAmount, has_proof: proof ? 1 : 0 });
+    return json({ ok: true, paid_count: r.paidCount, total_amount: r.totalAmount, has_proof: r.screenshotKey ? 1 : 0 });
   } catch (e) {
     if (e instanceof TokenUnusable) return errorResponse(410, "link already used", { code: "token" });
     if (e instanceof NoEligiblePayment) return errorResponse(409, "this period is already paid or finalized", { code: "payment" });
diff --git a/packages/worker/test/adapters/discord-pay.test.ts b/packages/worker/test/adapters/discord-pay.test.ts
index 88b46f9..c2856d2 100644
--- a/packages/worker/test/adapters/discord-pay.test.ts
+++ b/packages/worker/test/adapters/discord-pay.test.ts
@@ -1,5 +1,5 @@
 import { env } from "cloudflare:test";
-import { beforeAll, describe, expect, it } from "vitest";
+import { beforeAll, describe, expect, it, vi } from "vitest";
 import { routeInteraction, type DiscordInteraction } from "../../src/adapters/discord/handler";
 import { taipeiPeriod } from "../../src/core/time";
 
@@ -94,3 +94,51 @@ describe("button → channel select → settle", () => {
     expect(body.data.content).toContain("已登記繳費");
   });
 });
+
+describe("/繳費 with no R2 ignores the screenshot", () => {
+  it("tells the member to use channel/note when only a screenshot is given and R2 is off", async () => {
+    const prevB = (env as any).BUCKET;
+    const prevApp = (env as any).DISCORD_APPLICATION_ID;
+    (env as any).BUCKET = undefined;
+    (env as any).DISCORD_APPLICATION_ID = "app-9024";
+    let captured = "";
+    vi.stubGlobal("fetch", vi.fn(async (_url: string, init: any) => { captured = JSON.parse(init.body).content; return new Response("{}", { status: 200 }); }));
+    const i: DiscordInteraction = {
+      type: 2, id: "1", token: "tok", guild_id: GUILD, ...member(DISC),
+      data: { name: "繳費", options: [{ name: "截圖", value: "att1" }], resolved: { attachments: { att1: { url: "https://cdn.discordapp.com/x.png", content_type: "image/png", size: 100 } } } },
+    } as any;
+    const res = await routeInteraction(i, env, CTX);
+    expect((await res.json() as any).type).toBe(5); // deferred
+    await Promise.all(tasks.splice(0));
+    vi.unstubAllGlobals();
+    (env as any).BUCKET = prevB;
+    (env as any).DISCORD_APPLICATION_ID = prevApp;
+    expect(captured).toContain("未開啟截圖功能");
+  });
+
+  it("settles and notes the ignored screenshot on success (channel + screenshot, no R2)", async () => {
+    const U2 = 90247, S2 = 90248, DISC2 = "disc2-9024";
+    await env.DB.batch([
+      env.DB.prepare(`INSERT INTO users (id,workspace_id,discord_id,display_name,created_at,updated_at) VALUES (?,?,?,?,?,?)`).bind(U2, WS, DISC2, "Member2", TS, TS),
+      env.DB.prepare(`INSERT INTO subscriptions (id,workspace_id,user_id,plan_id,start_date,billing_day,created_at,updated_at) VALUES (?,?,?,?,?,?,?,?)`).bind(S2, WS, U2, WS, "2026-05-01", 5, TS, TS),
+    ]);
+    const prevB = (env as any).BUCKET;
+    const prevApp = (env as any).DISCORD_APPLICATION_ID;
+    (env as any).BUCKET = undefined;
+    (env as any).DISCORD_APPLICATION_ID = "app-9024";
+    let captured = "";
+    vi.stubGlobal("fetch", vi.fn(async (_url: string, init: any) => { captured = JSON.parse(init.body).content; return new Response("{}", { status: 200 }); }));
+    const i: DiscordInteraction = {
+      type: 2, id: "1", token: "tok", guild_id: GUILD, ...member(DISC2),
+      data: { name: "繳費", options: [{ name: "渠道", value: String(TAG) }, { name: "截圖", value: "att1" }], resolved: { attachments: { att1: { url: "https://cdn.discordapp.com/x.png", content_type: "image/png", size: 100 } } } },
+    } as any;
+    const res = await routeInteraction(i, env, CTX);
+    expect((await res.json() as any).type).toBe(5);
+    await Promise.all(tasks.splice(0));
+    vi.unstubAllGlobals();
+    (env as any).BUCKET = prevB;
+    (env as any).DISCORD_APPLICATION_ID = prevApp;
+    expect(captured).toContain("已登記本期");
+    expect(captured).toContain("已記錄你的繳費宣告");
+  });
+});
diff --git a/packages/worker/test/core/retention.test.ts b/packages/worker/test/core/retention.test.ts
index d19f41b..93fbc00 100644
--- a/packages/worker/test/core/retention.test.ts
+++ b/packages/worker/test/core/retention.test.ts
@@ -39,6 +39,23 @@ describe("runRetention reference-counting", () => {
     expect(await getObject(env.BUCKET, SOLO)).toBeNull();
   });
 
+  it("is a no-op when R2 is not configured (returns 0, keeps the row + object)", async () => {
+    const KEY = "noR2-key-9023";
+    await env.DB.prepare(`INSERT INTO payments (workspace_id,subscription_id,period,period_start,period_end,due_date,amount,status,has_proof,screenshot_key,paid_at,source,created_at,updated_at) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?)`).bind(WS, SUB, "2023-05", "2023-05-01", "2023-05-31", "2023-05-05", 315, "verified", 1, KEY, OLD, "user_web", TS, TS).run();
+    await putObject(env.BUCKET, KEY, new Uint8Array([4]), "image/png");
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const cleared = await runRetention(env, WS, 24, NOW);
+    (env as any).BUCKET = prev;
+    expect(cleared).toBe(0);
+    const row = await env.DB.prepare("SELECT screenshot_key FROM payments WHERE workspace_id=? AND period='2023-05'").bind(WS).first<{ screenshot_key: string | null }>();
+    expect(row?.screenshot_key).toBe(KEY);
+    expect(await getObject(env.BUCKET, KEY)).not.toBeNull();
+    // Clean up so this row doesn't affect subsequent retention tests in this file.
+    await env.DB.prepare("DELETE FROM payments WHERE workspace_id=? AND period='2023-05'").bind(WS).run();
+    await env.BUCKET.delete(KEY);
+  });
+
   it("keeps the R2 object when a non-expired payment still references the key", async () => {
     const KEY = "mixed-key-9023";
     const RECENT = "2026-04-15T00:00:00.000Z"; // within 24mo of NOW -> NOT eligible
diff --git a/packages/worker/test/core/settle.test.ts b/packages/worker/test/core/settle.test.ts
index ad6e8d8..44d29c0 100644
--- a/packages/worker/test/core/settle.test.ts
+++ b/packages/worker/test/core/settle.test.ts
@@ -66,6 +66,20 @@ describe("settleUserPeriod — Discord direct path", () => {
     expect(after).toBe(before);
   });
 
+  it("settles without a proof object when R2 is not configured (has_proof=0)", async () => {
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const r = await settleUserPeriod(env, {
+      workspaceId: WS, userId: WS, period: "2027-05", source: "user_slash",
+      proof: { body: new Uint8Array([1, 2, 3]), ext: "png", contentType: "image/png" },
+    });
+    (env as any).BUCKET = prev;
+    expect(r.paidCount).toBe(2);
+    expect(r.screenshotKey).toBeNull();
+    const rows = await env.DB.prepare("SELECT has_proof, screenshot_key FROM payments WHERE workspace_id=? AND period='2027-05'").bind(WS).all<{ has_proof: number; screenshot_key: string | null }>();
+    expect(rows.results.every((p) => p.has_proof === 0 && p.screenshot_key === null)).toBe(true);
+  });
+
   it("shares ONE screenshot key across all settled rows", async () => {
     const r = await settleUserPeriod(env, {
       workspaceId: WS, userId: WS, period: "2027-03", source: "user_slash",
diff --git a/packages/worker/test/env.d.ts b/packages/worker/test/env.d.ts
index 245794a..2e115dc 100644
--- a/packages/worker/test/env.d.ts
+++ b/packages/worker/test/env.d.ts
@@ -8,6 +8,7 @@ declare global {
   namespace Cloudflare {
     interface Env extends AppEnv {
       TEST_MIGRATIONS: D1Migration[];
+      BUCKET: R2Bucket; // tests always provide R2; override the app's optional binding
     }
   }
 }
diff --git a/packages/worker/test/routes/admin.test.ts b/packages/worker/test/routes/admin.test.ts
index 37b6fe4..1b1aa28 100644
--- a/packages/worker/test/routes/admin.test.ts
+++ b/packages/worker/test/routes/admin.test.ts
@@ -168,6 +168,33 @@ describe("admin API", () => {
     const res = await call("POST", `/admin/payments/${id}/reject`, { rejected_reason: "x" });
     expect(res!.status).toBe(409);
   });
+
+  it("reports r2_configured from the BUCKET binding", async () => {
+    const on = (await (await call("GET", "/admin/workspace"))!.json()) as any;
+    expect(on.r2_configured).toBe(true);
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const off = (await (await call("GET", "/admin/workspace"))!.json()) as any;
+    (env as any).BUCKET = prev;
+    expect(off.r2_configured).toBe(false);
+  });
+
+  it("delete-proof still clears the DB column when R2 is not configured", async () => {
+    const key = "1/2026-10/1/noR2.png";
+    const ins = await env.DB.prepare(
+      `INSERT INTO payments (workspace_id,subscription_id,period,period_start,period_end,due_date,amount,status,has_proof,screenshot_key,source,created_at,updated_at)
+       SELECT 1, s.id, '2026-10', '2026-10-01','2026-10-31','2026-10-05', 315, 'paid', 1, ?, 'user_web', ?, ?
+       FROM subscriptions s WHERE s.workspace_id = 1 ORDER BY s.id LIMIT 1`
+    ).bind(key, nowUtcIso(), nowUtcIso()).run();
+    const pid = ins.meta.last_row_id as number;
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const res = await call("POST", `/admin/payments/${pid}/delete-proof`);
+    (env as any).BUCKET = prev;
+    expect(res!.status).toBe(200);
+    const p = await getPayment(env.DB, pid);
+    expect(p?.screenshot_key).toBeNull();
+  });
 });
 
 describe("admin notifications", () => {
diff --git a/packages/worker/test/routes/images.test.ts b/packages/worker/test/routes/images.test.ts
index b22157e..39ad8f0 100644
--- a/packages/worker/test/routes/images.test.ts
+++ b/packages/worker/test/routes/images.test.ts
@@ -44,4 +44,12 @@ describe("protected image endpoint", () => {
     const res = await handleImage(new Request("https://x"), env, ctxFor());
     expect(res.status).toBe(400);
   });
+
+  it("404s when R2 is not configured", async () => {
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const res = await handleImage(new Request("https://x"), env, ctxFor(KEY));
+    (env as any).BUCKET = prev;
+    expect(res.status).toBe(404);
+  });
 });
diff --git a/packages/worker/test/routes/upload.test.ts b/packages/worker/test/routes/upload.test.ts
index 6015f3a..55e74cf 100644
--- a/packages/worker/test/routes/upload.test.ts
+++ b/packages/worker/test/routes/upload.test.ts
@@ -58,6 +58,16 @@ describe("upload info", () => {
     const res = await handleUploadInfo(new Request("https://x"), env, ctxFor("nope"));
     expect(res.status).toBe(404);
   });
+
+  it("reports proof_enabled per R2 configuration", async () => {
+    const on = (await (await handleUploadInfo(new Request("https://x"), env, ctxFor(RAW_OK))).json()) as any;
+    expect(on.proof_enabled).toBe(true);
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const off = (await (await handleUploadInfo(new Request("https://x"), env, ctxFor(RAW_OK))).json()) as any;
+    (env as any).BUCKET = prev;
+    expect(off.proof_enabled).toBe(false);
+  });
 });
 
 describe("upload submit", () => {
@@ -106,4 +116,17 @@ describe("upload submit", () => {
     const res = await handleUpload(uploadReq(RAW_USED, { note: "x" }), env, ctxFor(RAW_USED));
     expect(res.status).toBe(410);
   });
+
+  it("reports has_proof=0 when R2 is absent even if a file is posted", async () => {
+    const RAW = "raw-token-nor2";
+    const h = await hashToken(RAW);
+    await env.DB.prepare(`INSERT INTO upload_tokens (token_hash,workspace_id,user_id,period,expires_at,created_at) VALUES (?,?,?,?,?,?)`).bind(h, WS, WS, "2026-09", FUTURE, TS).run();
+    const prev = (env as any).BUCKET;
+    (env as any).BUCKET = undefined;
+    const res = await handleUpload(uploadReq(RAW, { screenshot: pngFile() }), env, ctxFor(RAW));
+    (env as any).BUCKET = prev;
+    const body = (await res.json()) as any;
+    expect(res.status).toBe(200);
+    expect(body.has_proof).toBe(0);
+  });
 });
diff --git a/packages/worker/wrangler.toml b/packages/worker/wrangler.toml
index 57b84db..eeaa051 100644
--- a/packages/worker/wrangler.toml
+++ b/packages/worker/wrangler.toml
@@ -17,6 +17,8 @@ database_name = "chippot-db"
 database_id = "your-d1-database-id"
 migrations_dir = "migrations"
 
+# 選填：不需要「成員上傳繳費截圖」可移除整個 [[r2_buckets]] 區塊（未綁 R2 時截圖上傳/檢視/
+# 自動保存清理停用，其餘功能正常）。需要截圖功能就保留，並先 `wrangler r2 bucket create chippot-proofs`。
 [[r2_buckets]]
 binding = "BUCKET"
 bucket_name = "chippot-proofs"