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Old 07-29-2019, 05:19 PM   #6
KevinH
Sigil Developer
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I am betting this is caused by missing nav manifest property in the calibre generated update to epub 3 which happens with that Upgrade Book Internals option.

So you might want to save the calibre generated epub after the update and post the epub (as zip here). That way we can see what is confusing Sigil.
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