Hi there,
Im playing between my phone and tablet (both Android devices). I am logged in to the same Play Games account on both devices with sync progress option checked on both devices.
Initially I thought this would be a cloud save (would be a great addition) but it doesnt appear to be so I thought it meant if I complete a scenario on one device it would show this with newly unlocked scenarios on the scenario select screen but this also does not seem to be the case.