So I'm trying to convert a bookshelf from sims 4 and I'm trying to make it functional. I did everything I could (as far as I know.) I assigned the mesh i'm trying to convert to the bones of a item from EP 5 which is generations.
It seems each step I try to make to get this thing to work properly just comes to the same conclusion. Am i missing something here?

The first picture is the base mesh from the game and then my conversion next to it (the shadow)
The second photo is the mesh I'm trying to convert. After doing the whole conversion process & assigning bones this is how it shows up in game.

The bookshelf probably lacked proper geostates. Bookshelves have three geostates (full, semi-full, empty), and when you buy bookshelves the game always generates the semi-full geosate. Here's a tutorial about geostates using TSRW.