Hey GOA-GodOfAim,
open your mesh in the content browser
use the show to look at the simple and then the complex collision
In Collision Complexity setting check the use complex collision as simple is enabled if the simple collision isn’t working
If you plan on having your model built on, mantled, grapplerable etc
Make a BlueprintClass Building Prop in the content browser and use your model in its mesh slot.
Use the building prop in your map instead