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I don't think any of this is causing the epubcheck error the OP is seeing. I've recreated their package and metadata section of the opf (using the data they provided) using Sigil's default epub3, and the only opf error that epubcheck reports is about the meta refine not pointing to a valid entry.
I'm also not entirely sure what is meant by "An epub upload to Google Play e-reader is failing."
Last edited by DiapDealer; 07-11-2026 at 03:33 PM.
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