Thanks for letting us know. This may be due to the size or file format, have you tried clearing your cache & cookies and using a different browser/mobile phone? This troubleshooter covers common issues and how to fix them: https://yt.be/help/2SLi . Let us know how it goes!
@TeamYouTube trying to upload a video and it says “error preparing upload” retrying it just shows the same thing, tried it with older videos from late September on my iPad and it’s fine.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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