Attach the same file to all user notifications

<?php
// attach the same file to all User Notifications
// add_filter("gform_notification", "add_attachment", 10, 3);
function add_attachment( $notification, $form, $entry ){
    // reference the notification by name
    if( $notification["name"] == "User Notification" ){
        // this is a path not a URL
        $uploadDir =  get_stylesheet_directory();
        // this is the file to be attached to all notifications
        $attachment =  $uploadDir.'/terms.pdf';
        $notification['attachments'] = array($attachment);
    }
    return $notification;
}