Q: PDFs not syncing to or from iOS devices

Use iBooks with PDF documents on your iPhone, iPad, and iPod touch - Apple Support

You can manually sync using iTunes, email the pdfs or use an app like Dropbox to copy pdfs across devices.

PDfs and non-ibooks store books don't sync automatically.

This does not work. I have manually synced my iMac iBooks .pdfs for years with no trouble.

Suddenly only a hand full appear on my iPad and iPhone. Not sure why only those few.

I have tried going to iTunes, finding my "DEVICES," going to Books and hitting SYNC.

SYNC works just fine, but nothing changes.

Not sure why this suddenly happened.

How can I get all my iBooks on my iMac back to my iPad/iPhone without having to go visit a Genius?

Thank you

Same exact thing is happening to me—everything worked fine, then two days ago all my local files I've put in iBooks don't show up in iTunes when I go to sync.