I had to return my Avengers game for stadia my kid jumped on before I did and played some of the campaign and there was not a way to start campaign from beginning or save slots.
I am hoping that it will be patched in so I can buy the game on stadia but I might have to get this on PS4 if this lingers for too long
Did you figure it out ?
no it’s still not working. No save slots, or anyway to restart game