Homesharing is ON in iTunes12 on my El Capitan iMac. Downloaded the Apple Remote App for iPad Air. Turned on Homesharing on the iPad Air Apple REMOTE App. I cannot view my iMac iTunes12 Library using my iPad Air MUSIC App. The only music I can play on my iPad Air are previous purchases from the store. I do not store any music on my iPad Air. Why can't I see and play the iMac music library?