Hi,

It's possible that YT has changed its parameters and the uploader no longer works properly.

Even if it works, I strongly advise against using it. You should always export the video and review it before posting it. Often there is a problem that was overlooked during editing or a problem with the export, incliding sound, or you notice that you missed something that wasn't obvious during editing. Better to find the problems yourself than be told by many others once posted.