title: automatically set the 300x300 image as a thumbnail, Is that possible?
body: <p>I have an website where you can upload from front end and when you make a new post the image goes into custom field imagepost and Wordpress makes 3 more images after the original with diferent sizes and dimension and if I make to set automatically original image as thumbnail some images are bigger than 8 mb and facebook says can't download my image so I need a solution to get into thumbnail image generated by wordpress , ex: image-300.270.jpg not the original image.</p>