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Problem With UCX Collision

Hi, I have a cliff wall that I’m trying to modify to use UCX collision (I can’t use complex collision) but any time I duplicate the mesh and modify it in Maya, it doesn’t import into Unreal. However, if I create a mesh from scratch, it imports fine.

So I have this CliffWall mesh duplicated with the duplicated mesh set to UCX and a simple cube set to UCX and only the cube shows up in Unreal.

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Any time I work off the original mesh, even if it’s duplicated, the UCX collision doesn’t import. Creating geometry from scratch in Maya will import fine.