Render[in] don't display the texture maps of the model

In SketchUp, you have two sides on a face, the positive side "the white", and the negative side "the blue". 

Render[in] only display the positive face so if you put a texture on the blue face you won't see it in Render[in].

If you don't see some textures it's only because they are on the negative face. 

You have to put these textures on the white face in the Sketchup menu "Entity info".