My epubs are universal, with the single exception that I don't include a cover in the version uploaded to the KDP. However, I don't use any media calls, having learned my lesson with drop-caps when they became available (not long before Amazon changed the line spacing in the KF8 devices, throwing everything off), so I suppose I am basically just uploading a Mobi 7 file with CSS, and not a Kindle-specific file in your definition.
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