It's not a Vault thing. I already have my CDs ripped and I can attach them to a Node via USB storage. The question is about my music collection, which Roon calls my Library. It shows me all my music, whether it's my ripped CDs or the Tidal albums I have flagged as favorites, and everything is shown together in one place. Other than a small "T" icon for Tidal on the album artwork, it's basically transparent to me that there is a difference between my CDs and Tidal albums. I don't have to go into a separate Tidal app within Roon to access Tidal. So this isn't about storage of the music, it's about the ability to access all of the music at the same time in one place instead of having to go to one place for Tidal albums and a separate unconnected place for my ripped CDs.
But perhaps a call to Bluesound will help. I will try that this weekend, if they are open.
Thanks a lot