Delete footprint

Hello! I’m very new to this and I’m having a hard time understanding how to delete a footprint. I downloaded an invisible crib mod by a creator named Martine. It said to download sims 4 studio and delete the footprint in order to make the invisible crib work with a custom crib. I followed a simple tutorial and deleted it via footprint >objectpolygons and saved it afterwards. Or at least I thought I did. My sim keeps having problems to make any kind of interaction with the baby when it is placed in the custom crib. As if something is in her way. I noticed that the tiles (seen in build and buy mode) underneath the baby is gone so I must’ve done something right.  (I also tried downloading and importing a file the creator recommended as the previous fix didn’t work for all players, but with no luck.) As I said, I’m very new to all of this so please go easy on me. Thank u!