To add a video to a step, first click Add Item at the bottom of the step. In the new Item that appears, select Video as the Item Type. You can upload the video either as a file from your computer or as a URL from YouTube. To upload a file, select Video File, the click Choose and navigate to the file, if you have a text file repeat for this file.
To add a URL select Video URL and copy the URL into the text box.
Click Done to add the video and update the step.