Ok, if I use EPub v2 then a toc.ncx file is included after conversion. If I use EPub v3 then nax.xhtml file is included instead. When clicking the Edit ToC button and clicking ok, the tox.ncx is added. It is not required in EPub v3, but according to
https://idpf.org/epub/30/spec/epub30...cx-superseded:
Quote:
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EPUB 3 Publications may include an NCX (as defined in OPF 2.0.1) for EPUB 2 Reading System forwards compatibility purposes
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I would like to do this when converting to EPub v3 docs - is there a way to make this happen in Calibre?