Custom upload directory with post title / need help for code

Im trying to use this to create separate upload directory for custom post type “gallery”. Its working fine excepts it creates two folders – one with post title and other with image title. Images are in the post title folder as needed. How can I prevent creating image title folder?
Thanks

function custom_upload_directory( $args ) {

    $id = $_REQUEST['post_id'];
    $parent = get_post( $id )->post_parent;
    $post_title = get_the_title($id);

    // Check the post-type of the current post
    if( "gallery" == get_post_type( $id ) || "gallery" == get_post_type( $parent ) ) {
        $args['path'] = WP_CONTENT_DIR . '/downloads/' . $post_title;
        $args['url']  = WP_CONTENT_URL . '/downloads/' . $post_title;
        $args['basedir'] = WP_CONTENT_DIR . '/downloads/';
        $args['baseurl'] = WP_CONTENT_URL . '/downloads/';
    }
    return $args;
}
add_filter( 'upload_dir', 'custom_upload_directory' );