I have an iPhone and a 27" iMac. I do most of the layout of the songs on the iMac, then create a full backup to a folder in iCloud. I can then, on the iPhone Restore Backup. When my bandmate tries to do a Restore Backup on his iPhone we get a message saying Data can't be used or authorized.
Just so you're aware, I can do a Network Session. I'm the Host with my iPhone and my bandmate uses Join Session.
He also joins my local WiFi network and we both have BlueTooth on.
I hope this makes sense..thank you in advance
John W.