I’ve done some more research on trying to figure out what is going on between C4D and Unreal. Here is what I have found out.
1.Name of UV Tags has no effect on importing the UVs
2.In C4D if you follow this workflow (Cinema 4D Workflow - Content Creation - Unreal Engine Forums) and have two sets of UVWs one for texture and one for Lightmaps. When you import the file into Unreal it will not import your material selections with it. Also if you check the mesh in Unreal it has 3 sets of UVs, The two you imported plus one it makes on its own I guess?
3.If you delete the UV Tag in C4D for the Lightmap and import to Unreal it will import your material selections and will create a second set of UVs for you for the Lightmap. I find this strange and perhaps something has been updated in Unreal that I am not aware of that automatically creates a Lightmap for you based off your texture map.
Can anyone shade some light on this for me?