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// add metabox to attachment edit page that will allow users to choose if to show this image in logo gallery
	function add_our_attachment_meta(){
		add_meta_box( 'custom-attachment-meta-box', 
			'Дополнительные настройки медиафайла', 
			'attachment_metabox_callback',
			'attachment',
			'normal',
			'low'
		);
	}
	add_action( 'admin_init', 'add_our_attachment_meta' );

	function attachment_metabox_callback(){
		global $post; 
		$value = get_post_meta($post->ID, 'featured_logo', 1);
		echo '
		<label for="featured_logo">Отображать эту картинку в галерее логотипов на главной странице?&nbsp;</label>
		<select name="featured_logo" id="featured_logo">
		<option value="0" '.selected( $value, 0, false ).'>Нет </option>
		<option value="1" '.selected( $value, 1, false ).'>Да </option>
		</select>
		';
	}

	function save_our_attachment_meta(){
		global $post;
		if( isset( $_POST['featured_logo'] ) ){
			update_post_meta( $post->ID, 'featured_logo', $_POST['featured_logo'] );
		}
	}