I can't get it to work (I have no idea what I'm doing either)

[Wubstroneer]

I put the jar (fabric version) in the Geyser extensions folder and put the .mcpack file in the Geyser packs file and the things don't show up.
I have the entity display pack and a pack generated by Rainbow for the items, and I downloaded both on bedrock and nothing shows up but a hitbox.
I'm using PolyFactory and PolyDecorations on Fabric 26.2

Java:

Bedrock: