You can try our Help Center article that has more info on all the supported YouTube file formats: https://goo.gl/yJEQri . Let us know if it helps!
@TeamYouTube every time I attempt to upload my vid, it says the file isn’t supported but it is mp4pic.twitter.com/v2fCUSHkDq
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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