After updating my iPhone and iPad Pro to iOS 12, I have an answer of sorts. When I first opened Books after updating, I got the notice that collections would only sync with devices running iOS 12 or MacOs 14, which implies that when I update my iMac next Monday (i.e. when the MacOS update is released), I should be able to organize my collections on my mac and have that show up on my various iDevices. Since audible books don't get copied to iCloud, I will still need to sync those to my device via iTunes, but it's a big step forward if everything works. We will see on Monday.
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