Video Section - how to get files to appear?

Via settings, I pointed "Videos" to 2 directories on my QNAP NAS, there are media files there (mpg / mp4..). I refresh but no files show up in the videos section. What am I missing?

Videos need to be grouped by folder. You should have multiple folders of videos in that root folder.

That did the trick (I posted from my ID for a server in Europe I have but answering from this/main ID)