Hmm, are you trying to upload a video or just audio? A file in .MP4 format is supported, but it has to be a video for the upload to be successful. Hope this helps clarify!
@TeamYouTube, I’m trying to post a .mp4 file and it says it’s not supported, plz help
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it is in .mp4 format and has videoand audio, but everytime I drag it from my folder i publishes,then says that youtube doesnt support that video file
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