wbntff Hey, meta-tags are currently auto-generated whenever the page is loaded (they are currently not cached). So if an image was changed and it isn't shown, I think the extension might not recognize the image as an image (perhaps the URL does not match the regex).
Currently it's not possible to select a custom static-image or description for a topic. However, I'm currently working on a 2.0 update that will include custom SEO-image, SEO-description and SEO-tags 🙂
If you have any other feedback, let me know!