@DoctorOhh - actually that isn't quite the case. If you mean using the "Update metadata" feature of Modify ePub to replace the cover (the original feature of the plugin), then yes this is the same code as Send to Device/Save to Disk and yes it has the same limitations of only being able to replace the cover in EPUBs where the cover has been correctly specified in the manifest.
However if you are using the "Insert/replace cover" feature of Modify ePub (which is what I would always recommend if replacing/updating the cover is your goal) then this uses completely bespoke code that will *always* succeed, since if it cannot detect an existing cover in the book it will insert a new page at the front containing one.
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