Add thumbnail attribute to GeneralSceneDescription Node Attributes, to be able to add a preview of the scene, allowing application to show this image when listing mvr files.
Thumbnail
[FileName](#user-content-attrtype-filename )
Optional
File name without extension containing description of the thumbnail. Use png file to provide the rasterized picture. Maximum resolution of picture: 1024x1024. The file is located in the root directory of the zip file.