When required to add a Yuja video into a discussion, use the Yuja Media Chooser.
Navigate to the Discussion topic.
Create or Reply using the Text Editor.
Select the Yuja Media Chooser
In the Yuja Media Chooser, select the video needed from your library.
Once the video is selected, scroll all the way down to the bottom to click Insert Content.
Review the selected video, and click the Reply button.