@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.
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!