I have a model in sketchup that I have sent to my Layout template. It is mounted to my first page ok, I can see in Layout that sketchup model window has the scene referenced.
When I copy the viewport and go to next page in Layout and past the copy, the viewport image is larger and it is not reference in the sketckup model scene. I tried to relink the the scene to the model but does nothing.
IIRC this has to do with very large SKP models - something about how the copy/paste is handled.
You should probably answer / respond in your other thread so we can help you with the heavy model… that seems overly detailed but it depends on what you need to do with it.