iCloud not syncing my PDFs in iBooks
iCloud has been great syncing calendars & reminders across my devices (iPhone, iPad, macbook) so when prompted by iBooks to sync thru the iCloud I agreed. But none of my new PDF files in iBooks migrated to my phone. Opened iTunes and discovered all of my PDF files are gone from Books (tho still display in iBooks). Unfortunately my iPhone synced and removed all PDFs from iBooks on my phone. Opened cloud drive and there are 0 files. So how do I get my pdf files back into iBooks on my phone? iBooks on phone is set to Sync Collections. iBooks on macbook is set to Sync Collections. iCloud on macbook doesn't have a checkbox for iBooks . All devices are running the latest OS.
MacBook Pro (13-inch Late 2011), OS X El Capitan (10.11.5)