Matsaly
If you have successfully connected the Mac to the MC200 then you need to add it in Roon, from the main window select the three horizontal lines click on it and then select settings, then select storage, then in the section marked as WATCHED FOLDERS select add folder then you can browse for the MC200 music2 folder.
If you have not connected the Mac to the MC200 then do exactly as above except when you go to WATCHED FOLDERS select the lower section NETWORK FOLDER and put the smb:// command in the network path box, then select add folder at the bottom.
Roon should then add your music from the MC200.
Cheers
Russ