I may of misunderstand the last post I thought it was an plugin for calibre but I think I was wrong, in any case, I have to try the python command manually or find another way to place the thumbnail under the device hard drive. like see if the thumbnails for mobi and azw3 work for the kfx format or not. I have to play around if it, in any case I hope calibre is updated at some point to support thumbnail and kfx format tranfering in the future versions of it.
from page 5 here
https://www.mobileread.com/forums/sho...=272407&page=5
so the extract_cover_thumbs modified for kfxmeta plugin, I was not able to import the zip file since it was not an plugin for calibre like I was thinking at first it was, if anything, the ebook is easy to put on the device, I just have to figure out how to place the thumbnail image their for kfx format, otherwise it seems to work without an thumbnail, but I would prefer to be able to load one if I can figure it out, any help about the thumbnail, or when calibre be updated to transfer the kfx format and thumbnail for it too, also calibre has an plugin for x-ray files, but I don't think the new kfx format supports that feature as far as I can tell.
one last thing if I understand it right the thumbnail has something to do with its support of ASIN of the KFX file created when converted, I just have to make sure it matches the information under calibre, and see if it generates an thumbnail then or not, again I am new to the kfx format plugin under calibre. so I have to experiment and see if I can get the thumbnail to be included in the file or not.
to not get the error below when converting from epub format to RB format into kfx format, make sure your source from epub format to rb format, has under structure detection the box label insert metadata as page of start of book that feature needs to be uncheck at all times when going from epub format to rb format, also needs to be unchecked when converting from rb format to kfx format, otherwise you will get the error below, I was able to convert my ebook once I made sure that feature was not selected in calibre.
Error(YJConvValidator):E120013: Data table found in the book