KF8 means Kindle Format 8. It has the file extension *.azw3 and is roughly equivalent to an EPUB.
So, since EPUB can be a series of image files (if someone was weird enough to want to make such an EPUB), so can AZW3.
By no means is it a requirement...
Note that there are other azw-type formats, e.g. AZW4 is Print Replica and contains an actual PDF file inside.
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