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Old 11-10-2022, 12:52 PM   #2
tomsem
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Posts: 6,944
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Join Date: Apr 2009
Location: USA
Device: iPhone 15PM, Kindle Scribe, iPad mini 6, PocketBook InkPad Color 3
Assuming you are talking about the Apple Books app. It expects things to be 'epubcheck' compliant.

There's an EpubCheck plugin:

https://www.mobileread.com/forums/sh...d.php?t=282067

It requires Java runtime installation on your computer.

There's also a Quality Check plugin, which might find some of the issues Books is complaining about (and does not require Java):

https://www.mobileread.com/forums/sh...d.php?t=125428
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