I have a MacBook Pro (Retina, 15-inch, Mid 2015) (macOS Mojave 10.14.6) and an iPhone 7 (iOS 12.4.1).
I downloaded an ebook from the internet, and started reading it on my MacBook.
A few days later I copied it onto my iPhone (using iTunes on my MacBook when my iPhone was connected).
I thought bookmarks would sync between the two devices, so I could continue reading on one device from where I left off on the other.
Unfortunately that isn't happening.
How can I keep my two books in-sync?