Now that Ingram Spark is only accepting epub 3 formatted ebooks what have you found for ways to do the converting. I tried sigil and calibre and neither would produce epub 3 files that would pass the validator. I finally found both another validator and a free online converter.
https://www.ebookit.com/tools/bp/Bo/eBookIt/epub-validator epub validator version4.2
And I found this converter which converts pdf files into epub 3 in seconds. It says not for commercial use but I don't see where it places any tracking info or anything in the file and it stores your book as a backup you can download anytime. Great for converting any pdf book to epub for easier readability. https://www.2up.ch/ is from sugarcube.ch
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