App Preview Video Wrong format - have tried uploading mp4 and m4v; is accepted however when i hit save it says error wrong format

I have got my app preview in the correct format and file type, and will upload as an m4v or mp4; but when i hit save it says error wrong format; any suggestions?

Just to share. I had the similar problem. Although the resolution is correct, I needed to set the aspect-ratio to 'square pixels, 1.0'.

I encountered the error message: 'Your file is in the wrong format.'

I fixed it by renaming the file from 'video.MOV' to 'video.mov'

I think you're saying that when you change the file extension of a recorded video from uppercase ".MP4" to lowercase ".mp4", it works. Is that correct? This seems like an issue with how the file system handles file extensions.

App Preview Video Wrong format - have tried uploading mp4 and m4v; is accepted however when i hit save it says error wrong format
 
 
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