I am adding albums to the storage folder that is supposed to be watch by Roon and nothing appears there. I can see the folder with the tracks there but they do not appear on the HOme screen tab Added. If I search for the album in question the results appears as Tidal, but the the album is there.
If they are files of albums you already have Tidal they are likely hidden and should show up under versions tab for that album as they are duplicates. Turn on show hidden files from the general settings and see if they show up in albums. If not reboot the core machine, still not see check for skipped files in library management to see if Roon has an issue with them.