cannot add a pdf to library
I'm using iTunes 12.2.2.25 on a late 2013 iMac under OS 10.9.5.
After having been able to do so for a long time, I can no longer use the File command Add To Library and then add a pdf to iBooks on my iPad 2.
Now when I look for the pdf in iTunes it shows up under My Music as Unknown Album.
Anyone know what's going on?
How do I get the pdf into my iMac?
Thanks, Barrie
iMac, OS X Mavericks (10.9.5), 3.5 GHz i7, 16 GB RAM, 200 GB free