Try opening the DWG as a library object (FILE menu > Libraries & Objects > Open Object).
You will need to change the file type to DWG.
Then save this as an object and see what you get.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10