Hello, please help: Unable to export YouTube videos from QuickTime Player.

It seems that YouTube has changed the method of video submissions to no longer allow the way that QuickTime Player attempts to do this. Previously, you would be asked for account details when using that option in QuickTime Player. Not sure when this was changed.

Instead, go to the YouTube website, sign in, go to YouTube Studio, and upload your video file there.

Unfortunately, the documentation doesn’t detail any of this at this time.