... daily trying for going on 4 weeks now. Accepted everything just fine thru the 394-pages PDF file. I'm stuck on the cover. In many tries, could not get a Xara DesignPro X9 PDF (1.07MB) to finish uploading; one day I read to use Chrome* rather than Firefox*. I tried ... couldn't even get into the KDP pages via Chrome. (multiple password changes required!) Back to Firefox, still no go with the PDF. Also had read to upload a .jpg version of the cover via Cover Creator.
Designed an entirely new cover; exported as .jpg (3939x2780px, 300 dpi, 1.42MB), uploaded with Cover Creator; viewed, looked good to me, clicked Save & Submit. Done; back to the upload page. Success! it said. WRONG ... nothing there! 'Enter an ISBN number' it said; I already had, one of my own (13-digit). Launch Previewer (next step) grayed out; won't work; won't let me 'move on' to pricing, etc. What did I miss? Help much appreciated. Thank you. ~Helen~

P.S. Thank you Talkgraphics for the June birthday wishes!

* latest versions.