Photos Mobile Why are videos tiny?

Setting up my first NAS. Put all our old photos and videos in the Photo folder to share.
Old videos in .mpg or .avi get passed on to VLC from the app on my iPhone and play normally.
However, .mp4 and .mov are played in the Photos Mobile app, but with a minuscule resolution in the middle of the screen.
What I have missed?

I might have been a bit premature, not for the first time.
Let me let the NAS finish indexing first.
Just watched an iPhone video that played funny before that now playing right. Just checked and the NAS is still indexing.

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