Hi Isabelle. To my knowledge if you „own“ the music (that is if you have purchased the records/cds etc, then you can convert them
to mp3 files and download them on the mo3 player they is integrated in the shokz openswim (I think that is the only format it supports). If your music is just downloaded from Apple Music through your Apple subscription, then Apple does not allow the conversion and you unfortunately cannot use it with the openswim.