Notify Users Button
There is a new button called Notify Users, which notifies users that a media item is available for them to view. Additionally, within the Notify Users tool, you can add messages to the notification, reply to a notification, and view the message history for all of these interactions.
To use this feature, simply select a media item to go to the media player page, scroll underneath the preview window, click the Notify Users button, then select the users or Groups you want and click notify. The users will then get a message that a media item from you is ready for them to view.
The user who receives the notification can reply to the notification message. To reply, click the reply (mail) icon from the My Messages page, add your response, and click Add Message. To view the message history for a media item shared through the Notify Users button, either click on the mail icon or visit the reply URL from the Notify Users message.
Watch this video for more information on the Notify Users button and for step-by-step instructions.