Playlist guidance/help

[CharlieClown]

New user here having just configured MinimServer over the weekend - running on a Synology NAS with my music files on the same NAS and using a HEOS iOS app for playback.

I'm using a Windows instance of J River Media Center to manage my music collection and one issue I've hit is exporting m3u Playlists in that the tracks are named as follows:

Z:\[CDs]\M-N\Modern Lovers, The\The Modern Lovers\02 - Astral Plane.flac

where Z is the mapped Windows share I have to my music folder on the Synology NAS (volume1/music). Obviously the NAS/MinimServer has no knowledge of this so I can understand why the playlists are not showing any tracks.

I've tried various config settings in J River (e.g. relative path names, server name instead of mapped drive etc.) but to no avail.

The only working solution I have is where I've manually updated the path in the playlist file to reference the volume/folder name:

/volume1/music/[CDs]/A-B/Bowie, David/Conversation Piece [5] 2019 Mixes - The Space Oddity Album/03 - Letter To Hermione [2019 Mix].flac

Any advice here? I appreciate this isn't really a MinimServer problem but I thought I might be missing something (really) obvious.