I tried this on one of the books I bought and it didn't work. I found the main thumbnail, renamed it 'backup' and removed it from the folder, put the cover I wanted in there and renamed it main_thumbnail, and it still showed the old one. I even reset the computer to see if it made a difference and it still showed the old one. When I went back into the folder to check it had two main_thumbnail files in there, the original and the one I had put there, so it is still getting that info from somewhere.
I also have the ebook in the library (on my computer) as a back up, so I was wondering if that had anything to do with it not working, but I can't see where to change the thumbnail file in the library.
Can anyone tell me what I am doing wrong? I am a bit pedantic about my covers, and it is really annoying me that two books I paid quite a bit for have a stupid generic 'Penguin' for the cover.
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