I received my AA the day before leaving on holidays which was great timing as it gave me a couple weeks to muck about and enjoy at my leisure. I think my wife has even forgiven me for adding yet another audio device to our lives.
At home I have a Synology NAS (DS3612XS) which holds my entire music collection ripped or purchased over the last 15 years (about 15,000 songs) in various formats. I added to the AA via the GUI but was initially uncertain as to the correct field inputs to make that work as I couldn't find specifics in the manual or elsewhere. For others' reference the settings that I used which worked were:
GUI | Gear Icon | My Music | Add new Drive
NAS IP: 192.168.1.2
FS Type: CIFS
It mounted TRUE as expected with 4.6 TB size and began scanning my files. Taken about 15 minutes so far to get thru about 400 of 1500 artists and still going.