Featured image and link

can I add images to a Featured image by a link from the network?

for example, in the text of the post, I can add a image by link from the network.

thanks for the answer! Do you plan to make “add posted link”? This is done in the theme wpdrudge. http://wpdrudge.com/docs/adding-posted-links

I am looking for the same functionality as vasik. I found this:

// Add External Link to Featured Image with Custom Field

add_filter('post_thumbnail_html','add_external_link_on_page_post_thumbnail',10);
function add_external_link_on_page_post_thumbnail( $html ) {
if( is_singular() ) {
global $post;
$name = get_post_meta($post->ID, 'ExternalUrl', true);
if( $name ) {
$html = '' . $html . '';
}
}
return $html;
}

and use a custom field on the post page but this isn’t working. I have added this code the my functions.php in my child theme. I assume that maybe there is a script in the theme that is overriding this functionality. Would it be possible to get a small amount of guidance on this. I would very much appreciate it.

What I am trying to do is have the covers to the magazines uploaded as the featured image and have them link to the digital flipbook online. It would be great if this could work.