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Paul's Prison Epistles: Ephesians, Philippians, Colossians

I originally added this book and uploaded a cover image as far as I remember, but it is still not showing. Is there a way to add a new book cover image?

It doesn't look like a cover image was ever uploaded.
Can you provide an acceptable source for cover?

Here's a link to the Dropbox file: https://www.dropbox.com/s/7xsxfiunkcp...

Here's a link to the author's book page: https://www.wayoflife.org/publication...

Not sure how to re-upload a file or attach one as a comment.

I can find no confirmation of ISBN at the publisher website, we need to confirm these issue details before adding a cover