Sharing Files with iPad 3 and iOS 9.3.5
I updated my iTunes to version 12.7, and now I am unable to sync files in iTunes. I am using UnReal book to manage music on my iPad and regularly update my music PDFs with new tunes, and CSV index files to go along with. Suddenly it seems I can't do this anymore. When my iPad is connected to the computer, iTunes does not offer file sharing as an option. I am assuming it is because I am not running "the latest version of iOS" that Apple's support doc says I need.
Does anyone know a workaround for this? My iPad cannot be upgraded any further.
iMac, macOS Sierra (10.12.6)