If you remix this here's what to do: Use "Edit 1" sprite, to put what sprite you want to be in the door. Put the sprite in costume1 and delete what's in it. Don't delete costume0 because it's just the sprite but invisible for when it doesn't need to show. Use "Rest of animation" sprite to finish the animation!
I just made this cus I'm bored :/ Oh and Btw... Credit to: @cs3483802 for screaming!