Where do I upload the finished A+ images?
Upload them in KDP → Marketing → A+ Content Manager:
- Start a new A+ Content project and select your book.
- Add image modules (or image-with-text modules).
- Upload the images you exported from the A+ Creative tool into each module.
- Add any text, preview, and submit for review.
Amazon reviews the content before it goes live — see How long does Amazon take to approve A+ Content? The tool creates the artwork; the uploading and submitting happen in your own KDP account — see Does the tool publish the content to Amazon for me?