I had 10 elevators in my bag and did /setfloors 9 after putting the first one down. It made 10 floors. So I made one more elevator and did /setfloors 1 to add one more. It just deleted all my elevators and made it 1 elevator. Did not refund them. I would think it would give me an error or refund them or something. Where did they go? Or drop them in front of me to pick up atleast.

I am not sure how to add onto elevators to make them higher once placed.