Drag and drop for audio files not working
I purchased some Shokz OpenSwim MP3 headphones to be able to listen to music and podcasts while swimming. The technology is allegedly simple - connect to my MacBook Pro, drag and drop my audio files onto the OpenSwim drive on my desktop. However I am unable to even grab my downloaded podcast files. Meanwhile when I try to drag music files only some of them (about 5%) transfer. The others bounce straight back to iTunes. These headphones can take MP3, WMA, FLAC, WAV & AAC. I've checked the file info for the tracks I'm trying to transfer and they're AAC. Any help appreciated.
Earlier Mac models