Windows 10 ( Ver 21H2). Vivaldi Browser (Ver 5.2)Also happens in Chrome (Ver.100).I am a premium member of YouTube and can download videos for offline viewing. So on my Win PC I downloaded many videos for viewing later.The next day I login to YT (using my browser) and navigate to the downloads page, to my surprise all the videos have disappeared. No explanation at all. Just a blank page with the message no videos here.
As an aside, on my mobile the videos remain available for any length of time.It's just on my PC using a browser that I have this problem.Any ideas will be helpful. ( Have already done the reinstall drill and tried different browsers vivaldi/chrome/firefox. all same result.).
Have raised this issue with YT Support staff and provided all details to them but no response for many days.
Best -Kevin