I couldn't transfer music files from my Samsung Galaxy S9+ to my MP3 player using theISB cable and connector. It's only charging the MP3 Player but it wouldn't let me switch to phone to carry out the transfer. I've done it before and it was ok, but now it won't allow me. I don't know what's wrong. Each time l click on phone, it says couldn't switch and it remains on USB Connect which only charges the MP3 Player. Regards.
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