When I insert a USB drive into the XA2 Xperia phone when I open the sony music app it seems to not recognise the external USB drive!
Yes, I can see it on both file managers that I have plus it's recognised on foobar2000 and also VLC, but on the folders option in the sony music app it only has the internal and SD drive showing.If you insert it does it give you the option to transfer files? Can you see the drive in your file manager app?