bringing 3d in from sketchup

I export my sketch up drawing then bring it in to twin motion but not everything is showing. I’m missing walls, moldings and various other things. do I not have the right stuff turned on or what? or am I not saving it right. I saved it with making everything a group and also save it with everything exploded, doesn’t seem to matter I get the same results either way. Can someone please tell me what I’m doing wrong?