In "Costumes" Sprite, insert your BG image for the first costume and your BG+Subject in your second costume. -Make sure the BG is exactly the same with no lighting difference or angle.
Random Idea May not be fully accurate but im planning to add future versions later May need to green flag it a few times to get it working properly, i also suggest not switching between fullscreen or tabs in the process (~7-10s). Hope you enjoy :)
