HELP! I can't see the part of texture in material

I use Maya for Unreal Engine 4. Everything would work well. But now, I made my models part to group (fbx) and I add material to my model (as I always do). I exported my model into UE4, I can’t see the part of texture. This would always work well. What do you think is this Maya problem or UE4? What should I do?

Just some part of model works.