使用add_attachment 插入附件后钩住以更新段塞：

function wpse_182454_attachment_id_as_slug( $post_id ) {
    if ( get_post_field( \'post_name\', $post_id ) != $post_id ) {
        wp_update_post(
            array(
                \'ID\' => $post_id,
                \'post_name\' => ( string ) $post_id,
            )
        );
    }
}

add_action( \'add_attachment\', \'wpse_182454_attachment_id_as_slug\' );