Showing CSGO knife skins in blues unboxing 3

So I recently got Blues Unboxing 3 from https://github.com/In-memory-of-CODE-BLUE/Blues-Unboxing-3, and in the steam content it had a picture of a csgo knife with a skin on. But when I make a weapon for a crate and add the model for a knife, just the default model comes up with no skin. If anyone knows a way to fix this i would really appreciate it. Thanks