Here is a step-by-step tutorial on how to embed videos within a block:

Step 1 - Choose your lesson:

Choose a lesson and the position within that lesson on where you want to embed your video.

Step 2 - Add a video block:

Click on the "Add Block" button and select the "Video" block from the list.

Step 3 - Select the video source:

In the "Video" block, you can either select an existing video from the media library or click on the "Element" button on the right side of the editor to add a new video element.

Step 4 - Embed your video:

In the "Select an Element" dropdown menu, choose "Video."

Step 5 - Add the video link:

Paste the link of your video from YouTube or Vimeo in the "Video URL" field.

That's it! You have successfully embedded a video within a block in Compozer.