I remember a couple years ago asking about a way to make Sigil regenerate a UUID because I was having problems with another app not recognizing that two epubs with same UUID were actually different books. I want to say it was Calibre but I'm not sure - other than Sigil and Calibre are pretty much the only 2 epub programs I use. Also, since I was made aware of the UUID concept, I make a new one each time....
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