[ds_tx]

Path substitution is point to the external volume, remember?
<pathsubstitution>
        <substitute>
            <from>special://profile/playlists/music/</from> <---This line is the Kodi default playlist path/directory, "special" replaces a long user related path)
            <to>smb://1.MacDOCS/Music/</to> <----This line "maps" the line above to my NAS path for my m3u files from media monkey
        </substitute>
        <substitute>
            <from>\\1.MacDOCS\Music\</from> <----this line is the path to each song contained within the m3u files, relative vs.absolute path
            <to>smb://1.MacDOCS/Music/</to> <---this line maps the line above to the Kodi friendly path of my NAS song directories
        </substitute>
    </pathsubstitution>
That works just fine on Mac with external drive MacDOCS, but not on CoreELEC with external drive 1.MacDOCS