Can't manually manage music itunes 12.3.1.23
I have iTunes 12.3.1.23, an iPhone 4S running ios 9.1 and I can't drag and drop songs from my iTunes library to it any more.
iCloud library is off. Apple music is off. Manually manage music is on. I have done a restore and it still won't do it.
any ideas?
itunes-OTHER, Mac OS X (10.7.5)