How do I link to a YouTube video in a discussion reply as an instructor?
You can add a YouTube video in a discussion reply by adding the URL of the video as a link to the response.
Note: Video playback defaults to the lowest resolution quality. Users can manage video playback options in the video settings menu.
In Course Navigation, click the Discussions link.
Click the discussion name.
Create a new discussion entry by clicking the Reply text field.
Embed a URL link in the discussion reply by clicking the Link icon.
Type or copy/paste the YouTube URL in the text box . By default, a small embedded image of the video will appear, showing the video you have selected. The link will also include a small thumbnail with an embedded video. Add alt text for the video in the Alt text for inline preview field . If you do not want to include the embedded video, click the Disable inline previews for this link checkbox . When you are ready to insert the video link into the Rich Content Editor, click the Insert Link button .
Click the Post Reply button to post your discussion reply.
View Discussion Reply
The embedded media can be viewed inside the discussion post  or by clicking Link  to view the media in a new window.