I have a 16 gb micro SD card in my Clip Sport. When I connect my device via USB to my Win 10 PC, I can see 5 folders in the root directory of the micro SD card. One of these directories is “Audiobooks”. After I copy audio files to the Audiobooks directory (or a subdirectory), I can listen to these files using CARD MODE on my Clip Sport.
CARD MODE allows the creation of one bookmark per audio file under Audiobooks.
Make sure you have CARD MODE turned on under Settings -> Customize -> Card: On.
