Yay for the new Google Photos embedding html-generator site I found! It's the only way I've been able to generate a link that you can see. (A Google Photos link, as opposed to Google Drive, which is my fallback method that always seems to work.) Now, we still have to hope they're not ephemeral like most of the other links (I kind of suspect Selena checks more often than you and thus gets the images into her browser cache, whereas by the time you check, the link has expired), but so far so good!