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I have tried every suggestion I have found here on this thread and a couple other web forums.  Still, most, but not all, the playlists that are hi-res return no tracks.  I leave the no-show playlists alone and give them all the time they need to identify tracks.  No luck doing that.  Non-hi-res playlists work fine.  I have made sure the Playlist folder is in the Music folder, not separate, on my Android Galaxy s10e.  I use MusicBee to sync.  I have tried syncing with m3u alone, pla alone, and then put both in the Playlist folder together.  There is nothing else I can do, except hope for some resolution provided on this thread.  Many thanks.
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hi @rkeesecker,

I also use MusicBee for my music playlists management & sync'n to all my devices & thumbdrives. I have an S23 Ultra now but do use a Note 10+ for burning in cables, headphones & DAC. I've had no issues with hi-res music playlists in UAPP.

As I sync'd across multiple devices for my Android phone I didn't sync my music or playlists from MusicBee to my phones. I just set up my folder structure to mimic my Roon R.O.C.K NUC & windows user Music folder structure.

You do have to change all the paths in the playlist though so for example the D:\Music\.. path prefix becomes \Music\...  & as long as the \Playlists\ folder is a 1st level child folder of the \Music\ folder on your android device this works. This ensures that all playlists display all tracks in all locations. Sometimes though i change a folder name or file format (flac to wav) & you need to update the folder name & files.
You can check how your device is reading the playlist by manually creating a test playlist & drop a couple of tracks into it from different folders through UAPP. then you can copy to your windows or mac laptop/PC open it & look at the path. them ensure that you mimic this in your playlists - then it will work. As you can see i have all types of music up to 32bit 384kHz & DSD512 (Octa) - all play from playlists on either of my Samsung phones with a DAC capable of native DSD512 playback (Chord's Hugo2 or iFi xDSD Gryphon)
This is the folder list in \Music\
00 - Hi-Res [Up to 192kHz · 24bit - PCM]
01 - Hi-Res [Over 192kHz · 24bit - PCM]
02 - Hi-Res [Up to DSD·128]
03 - Hi-Res [DSD·256]
04 - Hi-Res [DSD·512]
MusicBee
Playlists

& in \Music\Playlists\ I have more than 60 folders with playlists in them. The Path works on my S23 Ultra with 1TB storage - the path needed to be different for my Note 10+ as I had a 1TB MacroSD card & all music files were located on that.
sometimes you need a more complex path:
### Hi-Res music:
Replace:
D:/Music/

With:
afs://content://com.android.externalstorage.documents/tree/primary:Music/

but you can figure out the absolute or relative path by simply adding a track to a new playlist & viewing on windows or mac or an android file browser. Always ensure that you have the Playlists folder & the playlists within in the root of the \Music\ folder wherever that is.

Here is the start of a track list of one playlist that has a mix of hi-res & CD quality lossless tracks to give you an idea for the S23 ultra:

#EXTM3U
#EXTINF:226,Sophie Hunger - Le vent nous portera
\Music\MusicBee\Music\Sophie Hunger\1983 [44.1kHz · 16bit]\07. Sophie Hunger - Le vent nous portera.wav
#EXTINF:221,Dominique Fils-Aimé - Birds
\Music\00 - Hi-Res [Up to 192kHz · 24bit - PCM]\Dominique Fils-Aimé\Nameless [88.2kHz · 24bit]\2-Birds.flac
#EXTINF:364,Charlotte Gainsbourg - Deadly Valentine
\Music\00 - Hi-Res [Up to 192kHz · 24bit - PCM]\Charlotte Gainsbourg\Rest [44.1kHz · 24bit]\4-Deadly Valentine.flac
#EXTINF:286,Laura Misch - Hide To Seek
\Music\00 - Hi-Res [Up to 192kHz · 24bit - PCM]\Laura Misch\Sample The Sky [48kHz · 24bit]\1-01. Laura Misch - Hide To Seek.flac
#EXTINF:357,Spoon - Pink Up
\Music\00 - Hi-Res [Up to 192kHz · 24bit - PCM]\Spoon\Hot Thoughts  [96kHz · 24bit]\1-05 Spoon - Pink Up.flac
#EXTINF:250,The xx - Dangerous
\Music\00 - Hi-Res [Up to 192kHz · 24bit - PCM]\The xx\I See You [96kHz · 24bit]\1-01 The xx - Dangerous.flac
#EXTINF:329,Eric Clapton - Layla (Live)
\Music\00 - Hi-Res [Up to 192kHz · 24bit - PCM]\Eric Clapton\The Lady In The Balcony - Lockdown Sessions (Live) [96kHz · 24bit]\13. Eric Clapton - Layla (Live).wav
#EXTINF:432,Eagles - Hotel California (Live On MTV, 1994)
\Music\MusicBee\Music\Eagles\Hell Freezes Over (Remaster 2018)\06. Eagles - Hotel California (Live On MTV, 1994).wav
#EXTINF:244,Alison Krauss & Robert Plant - Rich Woman
\Music\00 - Hi-Res [Up to 192kHz · 24bit - PCM]\Robert Plant & Alison Krauss\Raising Sand [96kHz · 24bit]\01. Robert Plant & Alison Krauss - Rich Woman.wav
#EXTINF:271,R.E.M. - Drive
\Music\00 - Hi-Res [Up to 192kHz · 24bit - PCM]\R.E.M\Automatic For The People [192kHz · 24bit]\01. R.E.M. - Drive.wav
#EXTINF:255,The Cranberries - Dreams
\Music\MusicBee\Music\The Cranberries\Stars - The Best Of The Cranberries 1992-2002\01 - The Cranberries - Dreams (Album Version).wav
#EXTINF:166,Blue Man Group - Above
\Music\MusicBee\Music\Blue Man Group\The Complex\1-01. Blue Man Group - Above.flac
#EXTINF:196,The Smashing Pumpkins - Disarm (2011 Remaster)
\Music\MusicBee\Music\The Smashing Pumpkins\Siamese Dream\06. The Smashing Pumpkins - Disarm.flac
#EXTINF:218,Cold War Kids - Robbers
\Music\MusicBee\Music\Cold War Kids\Robbers and Cowards\07. Cold War Kids - Robbers.flac
#EXTINF:356,Frédéric Alarie - Exchange
\Music\00 - Hi-Res [Up to 192kHz · 24bit - PCM]\Frédéric Alarie\Mega Bass (One Microphone Recording) [192kHz · 24bit]\01. Frédéric Alarie - Exchange.flac

A screenshot of the start of the above playlist is attached.