Collisions

Prepare and transfer collision meshes alongside the assets they belong to.

Collision geometry can be prepared alongside the visual mesh so the exported asset arrives with the intended collision relationship.

Keep collision explicit

Collision meshes should be clearly associated with the asset they belong to. Ambiguous naming or transforms are common reasons for collisions ending up on the wrong asset or failing validation.

Validation

Check the collision object before export instead of relying on Unreal Engine to infer what you meant after the fact.