If i remember correctly:
1. Verify that the Autocad file has 3D information. AC cannot create a 3D mesh if there are only 2D elements. While you are at it clean up the file so you only have what you need.
2. Go to File ->Libraries and Objects -> Open Object
3. Select "Browse for a Folder" and check that you have DWG as an option
4. Select the DWG file
5. Place the Mesh as an object and use Convert to Morph if you need to edit.
Eduardo Rolón AIA NCARB
AC27 US/INT -> AC08Macbook Pro M1 Max 64GB ram, OS X 10.XX latest
another Moderator