What I do to have the mp3 I have on the pc on the iphone is:
– put the mp3 into my dropbox account, and then open dropbox in mi mobile, So I have all the audios there to meditate or whatever.
– open in the pc the “whatsappweb” , and send the mp3 to yourself in a message. And then you have it there in your chat in whatsapp. The thing here is that if it is a heavy document it wont pass.
So i Think best option is dropbox
😉 Hope it function. Now I have to see where the mp3 is it to do it hahaha