I wish I didn't, lol. Unfortunately, IngramSpark does require epub 3 for successful submission. I've tried the Sigil plug-in converter, but it takes an error-free epub 2 to an epub 3 with errors (per the epub validator) every which way I've tried.
Last edited by 2manymovies; 05-02-2017 at 06:08 PM.
Reason: accuracy
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