A few ideas…
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Make sure you are saving your audio files and m3u files inside the main Music Directory (or subdirectories).
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What method are you using to curate the ID3 tags of your audio files? I use ID3 v2.3 ISO 8859-1
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What method are you using to generate your m3u playlist files?
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Are you using a Mac or Win 10 PC, or other?
Maybe try using the shareware software “mp3tag”.for ideas 2, 3, 4.
