I used an extension called Bomb to fully explode all the components into basic geometry. You can also do it manually, details here:
Update - There is a SketchUp Extension called Bomb that can handle this process for you: https://extensions.sketchup.com/en/content/bomb There is a common problem with SketchUp models due to the way its Components and Groups are handled. They are interpreted as thousands of separate objects, which causes our processing to fail. Or, if processing succeeds, it really hurts viewer performance. The biggest culprits here are trees and plants, which are very complex Components nested in Componen...
And it worked:
mew1 skp test
I also HIGHLY recommend this tutorial:
As well as our exporter plugin: