In iBooks on my iMac, I found and downloaded a sample of a textbook. I can see it and read it in my iBooks library on my Mac, but I can't see any way to sync the book sample to my iPad.
If I look in iTunes in the Books section for my iPad, that book isn't listed. There doesn't seem to be any way to find it on my iPad.
iBooks (Mac) Help has this to say:
But I still can't seem to find any way to get that sample onto my iPad.If you buy a book on your Mac, it’s automatically available on all of your iOS devices with iOS 6 or later and with Show All Purchases turned on in iBooks settings. (Books made with iBooks Author aren’t available on iPhone or iPod touch.) To see all your purchased books on your Mac, choose View > Show Purchases in iCloud.
Any clues? Could it be because it's just a sample? And what sense would that make?