You can embed videos into your modules, welcome pages, and replay pages.
For Videos on YouTube, you can use the link.
Step 1 Click on "Share" under the video:

Step 2 Click on "Copy":

Step 3 Go to the Module, Welcome Page, or Replay and click on the "Insert Media" icon:

Step 4 Paste the link and click save:

Step 5 The video will show up inside the editor:

For Videos on Vimeo, use the embed code to insert the video.
Step1 Go the video, click on Share-->Copy Embed Code:

Step 2 Go to the Module, Welcome Page, or Replay and click on the "Insert Media" icon:

Step 3 Paste the code in the box, under the "Embed" tab and click save:

Be sure to use a Responsive embed code, NOT Fixed so that it can adjust to the screen size your clients are using.

Step 4 The video will show up inside the editor:

For videos on Amazon S3 use the Object URL to insert the video:
Step 1 Log in to your Amazon S3 account.
Step 2 Browse to find the video you want to add to your module.
Step 3 Click on the video title.
Step 4 Scroll down to find the Object URL and copy the link:

Step 5 Go to the Module, Welcome Page, or Replay and click on the "Insert Media" icon:

Step 6 Paste the link into the "Source" box and click "Save":