To import objects you need to make sure render meshes are saved, so typically you switch a view to say Rendered display mode, then save the file before importing into Blender.
If that still doesn’t work properly you can share the file with me - if you don’t want to do so here in public you can use our upload tool to share confidentially, where I have prefilled my email address so I get notified when the upload is completed. Please do copy a link to your post in the comment section so I remember what the upload is related to 
