You can add video clips to each element of your interaction along with other media content.
Importing a video may take some time depending on the file size. Once the importing starts, you will see its status in the progress window.
The video will appear in the content pane. Now, you can resize it, adjust its alignment, move it if you want. To preview a video, click the Play button on the thumbnail.
You will see the sizing handles (square dots) on the border of the selected video.
You can drag a video to a desired location holding the left mouse button.