I just tried that script from @Konrad_K_Sobon and it actually looks like it’s not working in this case:
The Python script doesn’t give any error in itself and it actually links the dwg in the file but then you don’t see the actual 3D object that is in the CAD model. The only thing you have to do is to run the Dynamo Graph from a Floor Plan view (if, like me, you run it with the active view inputting the Python script) as otherwise Python complains saying it can’t do that from a 3D view.
Here is the graph I’m using (in the Python node I just copied Konrad’s script)
The thing that I don’t really understand is that if you go in Manage Links you see the file correctly linked
But if you go in the Visibility/Graphics of the 3D view you see the same link but with the name “Import in Families”
Do you guys understand this?