My video file recognized as music?

in Twonky server UI on web / advance / rescan ← this does not work.

But when I open up by typing ip address + 9000 in webpage and go to mycloud setup and rebuild index on media, all the video files now moves to video folder so it shows in my DLNA enabled TV.

It seems I keep have to rebuild everytime I add new video file to NAS as I am keep testing and see the video files keep indexed as music file.