Collision issue :(

How do I make an object use one set of collision data for physics, and another for player interaction?
I need cheap convex for physics, and either per-poly for all other interactions, or convex that is detailed enough for those other interactions, but too expensive for the physics.
I’ve been trying to get an answer to this for a week. I’m new to UE4 and I’m not a programmer. I read the documentation and couldn’t find something relevant.

Bump again

You can probably use Collision Filtering for this: Collision Filtering - Unreal Engine