hi after importing model from sketchup to unreal engine 5.1 at few places the textures are showing black its not changing even after applying new textures.
Can you show the textures and materials as well? 
Sorry for late update, i got to know that it was normals issue and i fixed it too , we can fix it any 3d software like blender or maya or we can do it in unreal engine modelling tool as well.