Automatically generate the Featured Image from the specified image url in post.
Featured Image via URL is a plugin to generate the featured image of post from the image url specified. The image will be fetched back and saved into the Media Library with all supported sizes. If the featured image is already present, the plugin will do nothing.
This plugin is modified from Auto Post Thumbnail by adityamooley.
For more details, see http://tsai.it/project/wordpress-plugins/featured-image-via-url/