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This came up as I was building a Home Assistant add-on that serves the Calibre Library via a web server - it is based on COPS which is smaller than running Calibre's own web server. When opening an ePub v3 book without an NCX it throws an error - the cause of which took a while to track down. I can figure out how to work around this error, but given that in the ePub v3 guidelines I quoted earlier it is stated as best practice to create ePub v3 with both XHTML and NCX table of contents I thought I'd raise it here to find out if I hadn't discovered an existing Calibre setting to make it a simpler workflow, or suggest an easy addition in Calibre. By easier I mean for anyone using the add-on which is available through GitHub.
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