Changing primary image

If the page is for an episode, then the category of the image must be "still" (or something like that) and the width-to-height ratio must be greater than 1:1, such as 4:3, 16:9 or 2.35:1. If the page is for any material besides an episode, then the category of the image must be "poster" and the width-to-height ratio must be less than 1:1, such as 2:3. With the needed conditions being met, the option to suggest the image slide as the primary image is supposed to appear in the editing interface.