I emailed 12 epub files to my Kindle today. 9 worked and 3 failed. I loaded the three failing files into the Kindle Previewer program and they all had errors in the TOC. I found two cumbersome ways to fix them:
1. In Calibre’s TOC editor, delete all entries and rebuild it from scratch.
2. Use Calibre to convert from epub to mobi, delete the epub, then convert from mobi to epub.
Is there a simpler way to verify and fix the TOC using Calibre?
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