Welcome sean.scott!
Thank you for sharing this information!
Did you make sure that the mimetype file is uncompressed and on the first position in the zip file? Did you add an extension (.kepub.epub or .epub)? If you did, the Aura should be able to read it.
Could you please look whether the (x)html files contain tags like <span class="koboSpan" id="kobo.1.2"> and report it here?
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