load video to youtube

I'm trying to load a video to youtube.
I've done this for many years now.
Last time less than a month ago, without any trouble.
Since a week the loading hangs on "loading 0% ..." and hangs forever.
This happens with Linux Mint 21 and Linux Mint 20.
The video format is not relevant : tried some mp4 and avi.
Re-loading files already sucessufully loaded in the (near) past hangs the same "loading 0%..."
The size of the video is not relevant (anyway it's a few MB)
There is not Copyright problem (just a family party)
And it's not a porno (my g@d NO!)
The loading of the same file from Win11 (booting in win, or running Win from a VM (Oracle VM under linux mint)) works like a charm.
Summary:
- same IP
- same youtube user
- same ISP
- same ... everything
I've googled with no success :-(
Thanks if you have any idea/suggestion
:-)
p.s.
after loading the video (from win) I can edit it (name, description ... anything else) from Linux without any problem.