Syncing Books from MacBook to iPhone
I have a problem syncing a Book on my MacBook Pro to my iPhone 14 Pro Max. This is a book that I ripped from a CD. It consists of 40 .mp3 files. When I sync it using Finder (through a USB cable) it will only transfer about 36 of the files. By selecting only the missing files and re-syncing several times, I can get 39 of the files but that last one just will not go. I've tried disconnecting/reconnecting the iPhone, restarting Finder, deleting the book and starting over, and each time I get about the same results. Other books transferred in full.
I would also like to know how Finder generates the list of books to sync. I have books in various file folders, but none are in my Books app Library.
iPhone 14 Pro Max, iOS 16


![The “Sync audiobooks onto [device]" checkbox is selected. Below that, “All audiobooks” is selected to the right of Sync, above “Selected audiobook](https://help.apple.com/assets/63BCA927AAE78C58DD7FBE35/63BCA92EAAE78C58DD7FBE76/en_US/68918d33abff26a9304ea7db017aba54.png)