1. Use the smartsender link from Contacts/ Gear icon/smart sender tab to add a resource and you can choose to create or upload a youtube video.
Use the button corresponding to the item you want to add or the Link button to use a link to an online video , such as YouTube.
3. After you have created the resource, You can then add it to an email that can be added as a link in the message.
Call History>Dial session settings>Email>Email Library and choose to add an email or edit an existing and click the SmartSender icon to create a link.