"All good books have one thing in common - they are truer than if they had really happened, and after you have read one them you will feel that all that happened, happened to you and then it belongs to you forever."
It won’t let me upload pictures when wild releasing books. Even later on when I hit the edit button to try to add a picture, it keeps saying try again.
I was able to upload photos earlier - JPEG images. What kinds of images are yours, and how big? The site's supposed to re-size them, but if they're too large to begin with it may simply fail.
Also - I don't know if this is a factor, but in some cases the site works better if it's in secure mode. That is, if the URL is "https://www.bookcrossing.com" instead of just "http://". I know that applies to the bookplate labels; don't recall if it may affect photo uploads, but it's worth a shot.