Collisions can be a bit tricky depending on what you actually want to achive and moslty how.
Meshes interacting and hit trace don’t behave the same.
I could be helpful to have a bit more details on the type of colisions or hits, your are looking for.
Are you looking for trace hit ? or physically one meshes applying force on another one ? etc…
A few things to check.
Do you have colision enable (query and physics.)
Do you have a simple colision around the actual mesh.
Are you tracing ? check the trace channel.