Skeletal Mesh & Importable Physics Asset - Help Required

Hello everyone,
I have a rigged 3d model and i imported it as a skeletal mesh. However, when i create physic asset by replicating the 3dmodel with the box and other shapes, the physics are not that great.

I know it is possible to define the 3d model skeleton and get it importable inside Unreal Engine as a Physic Asset but i don’t know how to.
I am looking for someone that can help me on this matter. I can send over the 3d model and would kindly ask to receive it back with an importable physics asset.