I installed the Roon server on a Synology DS916+ and restored the library backup from an earlier PC installation and it all scanned and installed perfectly (2018-03-07 version from RoonOnNAS).
RoonServer is on an SSD (volume2) and the music files are on HDDs (volume1).
Music directories are set as local (to the NAS).
The problem comes when I add new music to the music directories, it doesn’t get added to the Roon library.
I tried Settings > Storage > Force Rescan on the directory and it appears to complete in less than a second, but nothing is added. On the PC version it scanned for many seconds.
If I edit the ID3 tags on an existing track, and rescan the album, it shows the changes, but not for completely new albums.