You don’t need “col”, where did you get that from?
Okay to put it simply:
MeshName
And for colliders goes:
UCX_MeshName_001
UCX_MeshName_002
UCX_MeshName_003
And so on…
So if your mesh has name:
MeshName_01
for colliders you will have:
UCX_MeshName_01_001
UCX_MeshName_01_002
UCX_MeshName_01_003
Simple right?