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There was a bug in iBooks. When file storage capacity is low, iOS deletes some iBooks files. The bug was that it deleted many files even if storage capacity was ok.

And I lost a bunch of PDF stored locally on my iPhone.

Today I synced again a few PDFs from Mac iBook → iPhone iBook.

Have two questions

  • how to check reliably that files are stored locally on iPhone (ie not iCloud)? I mean, I could use the airplane mode and see if files are still openable ... but maybe there is a cache or something.

  • actually, how to reliably use only local files - and get rid of iCloud access, at least for iBooks [ iCloud is off on my iPhone for iBooks, but files disappeared anyway ]?

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Related question: Books automatically deletes my books when offline, and when there is enough space on device

how to check reliably that files are stored locally on iPhone (ie not iCloud)? I mean, I could use the airplane mode and see if files are still openable ... but maybe there is a cache or something

If you are on iOS 12, then go to library and next to the book at the bottom-left there will be a cloud symbol if it is stored in iCloud and no cloud symbol if it isn’t.

actually, how to reliably use only local files - and get rid of iCloud access, at least for iBooks [ iCloud is off on my iPhone for iBooks, but files disappeared anyway ]?

Got to Settings -> [your name] -> iCloud and make sure Books is turned off.

Note: make sure you download all your Books before turning it off.

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  • Really odd that Apple offloads books, of all things, so aggressively. Of all forms of media, text takes up the least storage space.
    – Wowfunhappy
    Commented Jan 5, 2019 at 21:44

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