There's likely a folder hierarchy you're missing. For instance your xhtml files appear to be in the OEBPS/Text folder. Unless the files you inserted are truly in the same folder as the opf.xml file in the epub's zip archive, then that's why you would get the "not referenced" message. They're not manifested correctly.
How did you "insert" the files. It's best to use an inherent "Add Files" feature of Sigil/Calibre, so that all pathing will be automatically handled correctly.
Last edited by DiapDealer; 09-09-2020 at 10:04 AM.
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