Sorted!
I managed to download the mp4 file and embed it in the video folder of my EPUB3. But something is missing:
EPUB Checker reads: The "remote-resource" property was declared in the Package Document, but no reference to remote resources has been found.
This is the string that was automatically generated inside the manifest:
<item id="Balestrini.mp4" href="Video/Balestrini.mp4" media-type="video/mp4"/>
What is missing?
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