Make the toc.html the nav (import it to Sigil into an empty epub3 and copy and paste its contents into the nav.xhtml.
This assumes your toc.xhtml follows the general rules for nav.xhtml documents.
Then use Sigil's epub3 specific tools menu to generate the ncx from the nav.
Last edited by KevinH; 10-26-2022 at 06:24 PM.
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