Currently, the field of view (viewport) settings and hence the ability to view 16:9 media on a smartphone trimmed in 9:16 is currently only available for the background pagetype. Here even the background videos get trimmed so they fill the whole screen.
Would be great if also the pagetype "video player" would have an option to change the aspect ratio of the videos on a smartphone accordingly. Should be optional, as not all videos are suitable for trimming.
