When I do this... from 3dwarehouse (aka Sketchup pro) and i find like a 3D model of a truck... GMC Truck 3500. then i download the file, open it up in SketchUp pro 2018 "Trial ver" then i export it to a 3d Obj file. then i go into sh3d and import it.

Why does some of these images are missing like the Door, left or right fender, hood or even the inside of a tail gate on a truck?

But befor i export the file, it image looks good inside the SketchUp app?