The posts on these pages I tried creating bookmarks for weren't always properly recognized as image bookmarks - and if they were, the preview image wasn't always the full-sized image of the actual post, but often the low-scale preview image or a screenshot of some privacy policy pop-over. When creating bookmarks of such sites, asking wheter this is a "normal" or an image bookmark and letting me choose what image to use from the page (while selecting the largest available image as default) would seem a little more intuitive to me - going back to the app and manually selecting the right one is a little cumbersome.