Texture problem with Sketchup model.

Hi,

I'm still a novice with unity and I can't figure out what I am doing wrong. When I import a model created with Sketchup (and converted with Autodesk fbx converter) everything works fine. But when I try to change textures on models imported materials, it always just shows solid color on object. No patterns or anything show on the object in question. What am I doing wrong?

 

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