@TeamYouTube hi, I’m trying to upload a travel vlog to my channel but it’s saying the file is not supported but it’s MP4 and it’s what I always use 
We'd like to help. Which device/browser are you using? Does this happen across devices? Keep us posted.
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Using chrome on a MacBook. It’s happened once before but not for a while
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Thanks for the info. Could you try clearing the cache/cookies of your browser? Also, try uploading the video on a different browser or Incognito mode. Let us know if it fixes things for you!
End of conversation
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