You could some Timelines, and you could use them as matinee sequences to move the camera. Than You just have to set some boolean value to check what Timeline you was playing: create two boolean, “first” and “last”. if you are in the last position (last Timeline), set last to true and first to false; if you are in the first position, set first to true and last to false. Then you just have to create a basic code that set the visibility of the left button using !first (the negation of first: if first is true, don’t show the button, if it’s false show the button), and the visibility of the right button based on !last (if last is true, don’t show the button)