collisions not working on imported objects

I’ve modeled and imported a basketball hoop (for use with HTC Vive) and I can’t seem to get the collisions to work properly. The ball has a sphere collider, and I tried a convex-enabled mesh colllider with a rigidbody for my modeled hoop, but the convex collider prevents the ball from going through the hoop. I need it to deflect off the rim but go through the hoop. I added a box collider to the backboard and that works fine, but the rim has me stumped. Any insights? Thanks, everyone!

I used the Spacial Mapping Collider and used the modeled object as the parent object and that worked.

no need for convex , only add meshcollider thats it