Do you need to leave the Steam Deck open to download something on i.e. Firefox in desktop mode or will it just download perfectly in standby mode? I know that it’s basically a PC and it should work but since I’m planning to get one I want to be sure.
I'm not 100% sure about lock screen behavior since I don't have one set myself but I know it doesn't go to sleep as long as you keep it in the downloads page and it still has pending downloads, so I'd guess the same applies there.