Help with information on Tags -- what does the Naim UNITI read as tags on FLAC files?

Hello all, and thanks for reading this.

I plan to buy a Naim Uniti over the next couple of years (the arrival of a second child in a couple of months will dent my wallet a little too much this year).

As I'll be the stay-at-home parent, I plan to use the time to organise one of the HDDs on my QNAP 419P NAS as a dedicated music server which the UNITI will link to once I've got it. As it will predominantly be classical music, I'm wondering about the Tags that are associated to the FLAC file, and concerned that I organise them so that I actually know what I'm playing (where auto-tags can be a nightmare as there's no composer field).

So the question is: what does the UNITI display, or rather, offer in the menu selection? Or is this dependant upon which UPnP media server the NAS has incorporated? (The downloadable pdf menu is sadly a little lacking in offering information on this.) In the case of the QNAP NAS, it uses Twonkymedia, which I understand is compatible with the UNITI. The menu offers the following ways to search through the files, based upon the tags and also the actual filing system (ie if each album/symphony had a separate folder on the NAS, one could search through those too):


So, if anyone has any experience with creating tags and their relevance to how they're viewed on a UNITI machine, or indeed with using the TwonkyMedia server, I'd be most grateful to hear about it.

Thanks, Lenny