Rename the original epub file, just in case you need to go back to it.
Inside the folder you created when you unzipped the epub file, create a new zip file with the filename you want to use for the epub file, but with the file extension .zip.
First, add the "mimetype" file to the zip file.
Then add the rest of the contents of the folder, including the sub-folders, to the zip file.
Finally, change the file extension of the new zip file to .epub.
You should now have a revised version of your epub file, with the changes you made.
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