The instructions on this page do not seem to do it, https://support.atlassian.com/confluence-cloud/docs/display-files-and-images/.
Yeah, those instruction no longer work. :( Looks like it also shows your most recent images. So, you might be able to trick it into adding the image there by updating the image. If you go to the page that the image is on and go to the attachment section of the page. Then click properties and maybe update the attachment comment. I wonder if that would get it to populate in your recent uploads. I don't have enough images in my instance to get a good test of that.
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