As the topic. Moreover: me and my friend tried to make this work, saving and loading in different moments, like in menus, in mutation selection screen, after arriving to a level, midway in the level, after opening portal etc. Nothing seemed to budge. Please tell me if that option is functional at all and if yes then what we're doing wrong.
How does the saving/loading works?
It is definitely functional, a bud and I Throne every day. Hope this helps!
1. Go to Settings, Game, Delete Data(NTT starts out with everything unlocked, so you need a fresh save)
2. Go to Play, and on character select, enter /savegame plain.sav (Note: Can be any name, though having a new game save is nice in case you plan on saving multiple files)
3. Start CoOp with someone, and on character select, enter /loadgame plain.sav
4. Whenever you wish to save, just type /savegame (name).sav