Catalina messed with my Books

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Catalina is very reliable and easy to use OS - having that said, Books, Music and TV Apps keep driving me crazy.

This time stopped syncing. Of course with out any recognizable problem. No alerts displayed in any way. And Apple does not make it easy to solve puzzles like this. The whole iCloud Books syncing is a darn black box.

What I did to find the problem

  • Made sure my iOS-devices were syncing OK
  • Made sure my Mac was signed in to iCloud
  • Performed some rituals…
  • Took a look at ~/Library/Mobile Documents/
  • Found two suspiciously looking folders…

What I did to solve the problem

  • I trashed one of them…
    …and then mac OS started syncing:
  • And then it got weirder…
    • Suddenly my Mac thought I was using too much iCloud space:
      Which was weird, because mac Mac and iOS Devices were telling me I had > 1GB left!
    • Now what? Is my iCloud storage full or not?
    • Finder seems to think it's full too (and that's space left):
    • Awesome work, Apple!
  • I then started to delete PDFs from, in order to free space…
  • …after a while I noticed that was re-downloading them…
  • …so I deleted them once more! (Hint: Use your iOS-Device for deleting, it's mich more convenient!)
  • Now it didn't re-download the PDFs.


My guess is, that at some point couldn't upload files to iCloud - maybe because it would need more space that it had available (unclear). Then it stopped syncing and started queuing. So deleting files (and deleting them again) brought to the latest version of the Library where syncing worked again.