Same bug from 2D editor, now in 3D. after agree with steam eula, i'm unable to publish the mission, i got message "Pobieranie pliku steam nie powiodło się. Spróbuj ponownie później" (in english : Downloading steam file have failed, try again later) and no matter when i'll try, it allways throw this message.

Already tried reinstalling game, system, steam, nothing worked, please, communicate with steam and tell me what to do, i got scenarios from year old, waiting for uploading.