Quicktime is pretty much legacy now. Does the MOV file open in Windows Media Player, MPC-BE or VLC?
Direct YouTube uploads can be iffy, depending upon the time of day and YT's mood to receive the material. It''s apparently not a fault of VP.
The workaround is to export in a YT-approved format and use their uploader. https://tinyurl.com/y93rls5w
And someone here will be glad to check out the file if you take a minute to upload it to a free server, make it public, copy the shared link and post it here.