Hello. I created a very simple model and unwraped the UVs to channel 1 in 3D Studio Max. Somehow after importing it to UE4 something happened to the UVs. I tried importing it without generating Lightmap UVs. Here are the pictures of the model. The first screenshot was taken in 3D Studio max and the second one in Unreal Engine.
I have no idea what went wrong and where but I hope there is a solution to solve this problem.