WordPress at a glance
filter is not described

type_url_form_media filter-hook . WP 3.3.0

Filters the insert media from URL form HTML.

Usage

add_filter( 'type_url_form_media', 'filter_function_name_3050' );
function filter_function_name_3050( $form_html ){
	// filter...

	return $form_html;
}
$form_html(string)
The insert from URL form HTML.

Where the hook is called

media_upload_type_form()
wp-admin/includes/media.php 2190
echo apply_filters( 'type_url_form_media', wp_media_insert_url_form( $type ) );

Where the hook is used (in WP core)

Does not used.