Labeling collider meshes as UBX_meshname.istnacenumber
Usually does the trick.
And the docs to follow for naming/etc.
Ofc, I use my own custom FBX exporter, which I did modify to allow proper exports.
I honestly do not recall if the default exporter considers the naming that way or not.
But anyone can likely watch a blender tutorial on it. Surely there’s plenty…