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kovidgoyal · 06-17-2023, 10:15 PM

You will need to manually add the file to the spine in the opf, as simply changing a file extension is not necessarily a reason to add a file to the spine.

06-17-2023, 10:15 PM	#2
kovidgoyal creator of calibre Posts: 45,598 Karma: 28548962 Join Date: Oct 2006 Location: Mumbai, India Device: Various	You will need to manually add the file to the spine in the opf, as simply changing a file extension is not necessarily a reason to add a file to the spine.