I have tried using ctrl-B to show only files ,then using the plugin,but only empty folder without files moving into it.
because files has been group into folder according to filename ,therefore it is not a good idea to regroup them from scratch by this plugin,because this plugin will randomly group files.(not according to filename).

therefore I only to use this plugin when file already been grouped into folder,not pure files.

Please help if anybody know,thanks in advance.