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
- From the horizontal menu click "Detail Pages" and find your News Detail page.
- Click the gray icon to the right of News Detail, and select "Edit Page Content"
- 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
- Click Apply Changes.
This will now display videos on any news story that you add a video to