I needed to edit the ISBN# and add a few additional lines of metadata to the opf file in my epub. I used the "Tweak book" feature to explode the epub, edited the requisite data using Notepad, and then I used the "Rebuild epub" option to recompile it, but unfortunately, the changed ISBN number and additonal lines I had added to the original opf file arent showing up in the Library info now, even though when I re-explode the epub and open the opf file, I can see all the additional new information I have added to the file. I've tried exiting Calibre and restarting it again, but somehwo the info just doesnt show up.
Is it not reflecting the change in info, because I'm not supposed to add info into the Opf file in the Tweak book option?
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