There were still some issues with epub conversion when I uploaded to Kobo (I'm NOT a put all your eggs in Amazon's basket person), and Mark Lefevbre at Kobo
suggested Sigil, which I downloaded.
Not exact matches
Sigil suggests converting the document to HTML before importing the document.
However, if you're not confident editing code, I highly
suggest using
Sigil to check and edit your epub after exporting from InDesign.