>>>>>The groups and descriptions are missing.
Sorry, I thought you mean descriptions for Layer states.

Layer groups in AutoCAD for Mac are the same as Layer Filters in AutoCAD for Windows, and import - export of Layer Filters (Groups) is not yet available in plain AutoCAD? including AutoCAD for Mac.
Please look at this AKN article:
https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/How-to...