Have a look at the release notes and then look at the knowledge base article that addresses roontags. Or search the forum for roontags for the links - it’s all set out in there.
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I did search and could only find where it was stated that links to subdirectories were not shown or useable in internal storage. I also know about tags in Roon. There is probably a workaround someone may have discovered and if you know one perhaps you could detail it.
Roon is great, but it needs to improve the handling of classical music. I hope you can make a deal with Primephonic or Idagio so you can substantially improve the quality of the metadata.
Full integration would be even better of course. Qobuz is a substantial improvement over Tidal, but the quality of the suggestions and playlists at Idagio are really quite something.
That being said, I’m happy as punch. Roon is one of best luxury items I have ever bought. It looks like they have now a sustainable business and further improvements will no doubt come.