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You can add existing files to an open epub - e.g. text from existing .txt or .(x)html files - images - and styles (.css) and fonts.
If you add an existing .epub - which is a mix of the above packed in a specially designed .zip archive - it will be imported as some sort of "other media" (like a video or such) - which is not editable in Sigil.
If you want to ad some parts from an existing epub, you can unzip it and add those parts of it, you want.
Regards,
Kim
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