I’ve been setting up my next book in Kindle Direct Publishing (KDP.) This is the second book I have published through KDP, and it’s a reasonably straightforward process. I first uploaded a draft of the book and cover months ago to check that I had the formatting right. This is something I recommend doing; if your text layout goes into the trim area, or has some other problem, the upload will be rejected. You want to make sure your design is right before you finish the layout of your whole book. Anyway, I just finished the manuscript and went to upload it and the updated cover. When I did, I got an Internal Error for both the cover and the book. That confused me, as I hadn't made significant changes to the formatting. I tried uploading the previous version of the text and cover—the ones that had uploaded successfully some months ago—and got errors on those too! I tried some different things uploading different versions and managed at one point to g...