MAS ‘preview’ picture size


I’m trying to prepare my first app for MAS submission (macOS) and have issues loading app « preview » pictures.
I’m loading pictures from App Store Connect.

’Screenshot’ pictures load ok, ‘preview’ pictures are rejected
Apple doc for picture specifications is here:

For Mac App Screenshots:

Mac: One of the following, with a 16:10 aspect ratio. 1280 x 800 pixels ... 2880 x 1800 pixels
My ‘screenshots’ pictures are 2880x1800 (png, 144 dpi) and are accepted

For Mac App Preview there’s only one accepted size:

Mac: 1920 x 1080 pixels (16:9 aspect ratio)
My ‘preview’ pictures are exactly 1920x1080 (png, 144 dpi) and are rejected ‘incorrect size’.

Does anyone have a clue about the correct ‘preview’ picture size ?

Thanks !

The preview is actually a video.

Your screenshots should be 16:10 at the correct size and if you provide a preview video, it should be 1920x1080 mp4.

It wasn’t obvious at first (to me), and the message about size is misleading.

Thanks Jeremy !