MacOS uses the LF (line feed) character for text file line endings.
Windows uses the CRLF (carriage return + line feed) characters for text file line endings.
SanDisk mp3 Players only recognize the CRLF line endings for m3u Playlists.
The Windows Notepad++ app has the unique ability to display (and modify) the line ending characters.
View->Show Symbol–>Show End of Line.
There is no native Notepad++ app for MacOS.
The WineBottler app for MacOS allows MacOS users to create a working version of Notepad++.
See this link for a discussion of this topic and a link for downloading Winebottler for MacOS.
Hi @dfeld2005,
Have you opened a Support Case? If not opened, for more information, please contact the SD Technical Support team for best assistance and troubleshooting: