The reason the videos are not showing in the News item is because the News Detail Page does not have the Video Category on it. To add this go to:

onMessage > Website > Main Site 

  1. From the horizontal menu click "Detail Pages" and find your News Detail page.
  2. Click the gray icon to the right of News Detail, and select "Edit Page Content"
  3. From the column on the left, locate "Videos" and drag and drop this onto your Detail Page where you would like videos in your news stories to display
  4. Click Apply Changes.

This will now display videos on any news story that you add a video to