metabox.io media-grid.min.js not loading on frontend form

i added setting same problem

function mb_allow_subscriber_uploads() {
    if ( is_admin() ) {
        return;
    }

    // Replace 'subscriber' with the required role to update, can also be contributor.
    $subscriber = get_role( 'subscriber' );
    $subscriber->add_cap( 'upload_files' );
    
    
    
}
add_action( 'init', 'mb_allow_subscriber_uploads' );