Thanks, Ken! Yes, it’s a fixed-layout EPUB. I appreciate you sending the validation tool. I tested it and it gave me these warnings:

This twice about two PNGs (they used underscores, not blank spaces to be precise, and were auto-generated by Animate as it was their sample animation): “Filename contains spaces, therefore URI escaping is necessary. Consider removing spaces from filename.”

As well as this: “Item ‘iTunesMetadata.plist’ exists in the EPUB, but is not declared in the OPF manifest.”

Not sure if either is a real issue or not regarding animations working or not.

EPUBs are not a traditional project of mine. I know the supporting software like Animate and InDesign, but getting the export to work has been weirdly difficult, at least for me.

And thank you for your offer, I will reach out to via the info@ email on your site this morning (EST).

Cheers,
Keith