At this point, I uninstalled the app once again and reinstalled it. It then also showed playlist track numbers against each track - effectively like the normal uPnP Naim app format for an album. This initially displayed the playlist as though it was one of the albums, namely the header was one of the Album Titles rather than the Playlist name and it also displayed the cover art of that album above all the playlist tracks. I then recreated the same playlist with J River Media Centre. (I didn’t test reinstalling the app at this point.)
It found all the metadata correctly but just displayed Artist and Title with no cover art. There were no obvious differences looking at the two m3u files in Notepad. However, deleting and reinstalling the Naim app resulted in one playlist then displaying all artists and titles plus the cover art.
As explained above, on some tracks it failed to read the metadata so this wasn’t written into the file and logically not displayed. The software was configured to display Artist and Title. I created two playlists with Playlist Creator.
This seemed to work very well although it´s thrown up another issue in the way either asset uPnP or, more likely, the Naim app seems to read these files. Have also tried J River Media Centre which is very swanky although will cost me $59 after 30 days.
