As near as I can tell KindleUnpack does not have capability to unpack images from an azw6 file that accompaniesan azw3 file.
There is a DumpAZW6 utility in post #1145 of this thread that extracts jpeg and wdp images from an azw6 file to a azw6_images directory. Choryu Park used that as a basis for a patched DeDRM that merges azw.res and azw file pair from K4PC into a unified azw3.
https://github.com/apprenticeharper/...ols/issues/483
https://github.com/choryuidentify/De...v6.6.3-patched
Code from the above was used to make a separate calibre plugin
https://www.mobileread.com/forums/sh...d.php?t=343768
I can't run K4PC, the above plugin does not work for me with azw3/axw6 delivered to kindles, and anyway I would prefer to use KindleUnpack from CLI to unpack an azw3 azw6 combo into an EPUB.
I am hoping the the above is enough raw material that it would be easy for a KindleUnpack developer add an option to incorporate the images from an azw6 file while unpacking an azw3 file.