On android if you press onto the screen and drag off to the app view button, that touch instance will persist until you leave the game. This makes it impossible to perform any single-finger gesture because roblox interprets it as a 2 finger gesture because it thinks you still have that first finger on the screen.
So if this happens to you, which it’s very likely to given the placement of the thumbstick, you won’t be able to move your camera or perform any other single-touch gesture.