Docx -> Calibre -> epub2 (Images/page in Tablet mode)
Upload epub2 to Amazon and also Smashwords for most places except Google & Amazon.
If desired upload epub2 also to Google Books/Playstore.
I can't see the point of Kindle Create except for personal use of someone only with a Kindle. The more ordinary way of putting a suitable size image in Word or LibreOffice Writer makes more sense otherwise.
Last time I booted Win7 and looked the Kindle Create looked very limited compared to Docx -> Calibre -> epub2 for upload to KDP. For a local Kindle the best result seems to be converting the epub2 rather than docx. AZW3 for most kindles. Old mobi for steam powered models and dual mobi if not sure what the friend has, or if uploading to Smashwords for Kindle. I upload msdoc version from LibreOffice to Smashwords for PDF and LRF formats.
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