I can't import models correctly, why?

I try to import .blend models, but they import as smooth. I did some changes in fbx importer (in the inspector menu) and in Blender. The model gets “non smooth”, but I can’t aply textures or materials to it.

I tried .fbx, but the model simply doesn’t appear.

I tried .obj, the model loads correctly, but I can’t aply texts. or materials.

(When I’m saying I can’t aply the textures, I mean I can aply, but the textures doesn’t work correctly. The object gets green, or brown, etc)

try importing the texture as different format, or try exporting the texture attached to the object