Quote:
Originally Posted by jonalbert
epubcheck validates the file
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Is the ePub very large or contains only one large .html file that contains all chapters?
If yes, do an ePub to ePub conversion with Calibre, which will split the .html file into several smaller files.
If not, you'll have to use Calibre's ePub editor, which by now offers most of Sigil's features.