While importing the 3D Model nothing special happens. When you try to open the 3D Model to edit it DS will tell you it's opening the File but nothing more happens and when you try to interact with DS it will just go into not responding. I tried FBX as well as GLTF for the export. The same model works without Rig so it looks like the problem has something to do with that. 

3D Model

https://filesender.qt.io/?s=download&token=8f601a43-65cb-4de5-a8ff-d259ad984499