I had done my material work on an older version of Blender (2.7).
Now I updated my Blender version, my older mesh had several materials, but now I can only see one.
Why I only see one material? When I select one image of the older, its unwrap right so all is there where it should be, when there was this picture on this place, but when I go to the UV Image Editor I can't see the unwrapped mesh.