You can turn on email notifications by navigating to the folder you'd like to receive notifications for and clicking the bell icon.
To turn off notifications, navigate to the folder you'd like to remove notifications for, and click the bell icon again.
When this icon is green, your notifications are turned on.
When gray, they are off.
To change the frequency of your notifications from instant to a daily summary, simply click the "switch to daily emails" link at the bottom of the email notification.
If you are the uploader, you will receive a notification when your asset is available regardless of whether or not you subscribed. Notifications you sign up for and ingester notification are sent at the same time, when the asset is playable in the Web Viewer.