Sometimes WordPress takes the first image I add to an article and makes that into the post thumbnail. Other times it takes the second. Or whatever inage it feels like. And even if I remove the image from the article, IT KEEPS IT AS THE THUMBNAIL.
Bloody hell this is frustrating. Why can't there be a "Use as thumbnail" checkbox in the image upload? And why the hell does it keep the thumbnail even if you remove the image because WordPress decided to arbitrarily use the 2nd one uploaded instead of the first, or vice versa? Some predictabiity in what WP is going to do would be friggin appreciated.