Possibly the file is corrupt?
Is the image a jpg or png? Some image types like tiff are not accepted in epubs.
How did you convert from AZW3 to epub? Did you convert using Calibre, or did you use KindleUnpack (a Calibre plugin).
Maybe try KindleUnpack and then run ePubCheck on the file to find any errors.
ePubCheck is a plugin that needs to be installed.
|