The procedural textures in the model program (3dstudio) need to be baked first before to import in med

The textures making in the model programs are only supported for the program you use for making

You try with normal textures (no metals, glass, wood made with 3d studio), and check if import

I have the same problem with my program the solution use normal textures and in gamestudio use shaders for simulate metals or other things