Hi there!
In the past years i had dozens of multiplayer games on my map, unfortunately it is not possible at the moment.
I saved and packed the map as always then i agreed at the next window to upload to the server, it sayes "upload fertig" so its all good as far as i know (then i uploaded to steam workshop too, via content tool), and it still not want to appear in the multiplayer map selection section. I also tried this with a test map, and it also does not work. So what could be the problem if i did the same as i did for years?