Amazon take the cover upload (at much higher resolution) and the epub upload separately anyway.
My workflow:
- edit in LO Writer saving in ODT. Use Styles.
- Final Save As in docx
- Make epub from docx in Calibre.
- Separately have image of cover edited at twice resolution Amazon wants. I use the Gimp, but use whatever.
- Export a reduced to Amazon size png and tif. Used for Google, Smashwords, Apple, Barnes & Noble, Kobo etc too.
- Export 1072 x 1430 jpg image for Calibre for personal use.
- Add that in Browse for Cover in Edit Metadata.
- Proof ebook on a Kobo, re-edit LO Writer version, delete epub and recreate from docx
- Upload final epub and large image to Amazon etc and enter all metadata and pricing. Four separate tasks.
Repeat step 8 as needed. The ebook record isn't deleted, just format.
Amazon doesn't use the image in the ebook.