Quote:
Originally Posted by DNSB
Otherwise, you can open it in Sigil or the calibre e-book editor and take a look at the package version in the .opf file.You can also tell by multiple other tells such as seeing properties="nav" attached to one of the xhtml files.
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I tried with the editor in Calibre. I can see the ePub version in the .opf file. Thanks for the tip. Unfortunately, I trashed the faulty ePub I had. But I'll try that Quality plugin to see if I have any ePub 3.
EDIT : Turns out I have many ePub 3. 256! I can see that from the top of the list that many were sent to my Kindle with no problems.