+1 lostbears. I don’t know how the Bluesound Vault handles files already copied onto a hard drive. Maybe it transfers them, retagging, making them readable for Bluesound OS. I know I had some difficulty with the Node 2 accessing files on a NAS because it could not recognize much if the artwork that I had with Itunes, some artwork was missing from ripping, and other unrecognizable files. Bluesound likes a file folder it’s own way with each song as a file and the album artwork in that folder as a jpg.
https://support.bluos.net/hc/en-us/articles/360000368827-Why-is-some-of-my-Album-Cover-Art-shown-as-...
https://support.bluos.net/hc/en-us/articles/360000368827-Why-is-some-of-my-Album-Cover-Art-shown-as-...