I have a similar layout, and roon finds my .m3u playlists. Are the paths to the files in the .m3u playlist absolute or relative? Do they use a drive letter instead of the file share name? Don’t know if any of that makes any difference. Maybe post a snippet of the playlist file contents?
Edit: Just looked at mine. The playlists are in the media/music directory and the files are listed relative to the current media/music directory, like this:
.\The Beatles\Let It Be\06 Let It Be.flac
.\Pat Benatar\Precious Time\01 - Promises In The Dark.flac
.\Cyndi Lauper\She’s So Unusual\02 - Girls Just Want To Have Fun.flac
.\Pointer Sisters\Break Out\02 - Automatic.flac
.\Leon Russell\Will O’ the Wisp\10 Laying Right Here in Heaven.flac
.\Jackson Browne\The Very Best Of Jackson Browne\Jackson Browne - 206. Lawyers In Love.flac
.\Donald Fagen\The Nightfly\07 - The Goodbye Look.flac
.\The Beatles\Abbey Road\15 Carry That Weight.flac
Again, don’t know if it makes any difference, but maybe if roon can’t find the files it doesn’t import the playlist?
I was having this exact issue. I checked the Playlist Import setting that nuwriy mentioned and mine was set to Yes. I turned it to No and saved. Then turned it to Yes again and saved and all of my playlists are now showing. Must have been something cached that needed a little nudge.
Adding a bit more context. Originally my playlists weren’t working at all due to the the drive letter issue mentioned above. Instead of editing them to use the drive letter of my Roon library, I set them up with relative paths.
Since I keep my playlists in D:music\playlists\ folder, I changed the path from this
D:\music\Esquivel\Space Age Bachelor Pad Music\08 Music Makers.flac
..\Esquivel\Space Age Bachelor Pad Music\08 Music Makers.flac
This was working fine for a long time. Then the newer playlists started not showing, resolved by unchecking and checking the Playlist import setting.