I'd like to update a cover > Likes and Comments

I'm trying to update a cover to my book but although I thought I was following the instructions, I keep getting an error message and was then told to post in this group. The Wrong Sort To Die The cover showing is the very first one which was replaced in 2021. How can I do this? Even if I merge editions, this may not help. I want to ensure the ebook and paperback cover is the same as that showing for the hardcover and audio and not either of the ones showing for ebook or paperback. Thanks