Lightmaps and multilpe materials from Cinema 4D

Hi, I’m modeling my own set of modular meshes to build my levels. Those meshes have multiple material on them and all works fine until I build the lighting that shows a shadow bleeding between a mesh and the other. So I have to Unwrap my second UV to correct this issue BUT, if I add a second UV map, my multiple material slots disappear in UE4.

So how can I have both? I use Cinema 4D, can someone explain this to me?

I found the solution, after I generate a second UV I have to rename them differently (like UVW1 and UVW2) and place them at the end of all tags