https://community.canvaslms.com/docs/DOC-10405
You can create an announcement to share important information with all users within your course and with users in sections of a course. In your notification preferences, you can choose to receive notifications for announcements created by you as well as replies to announcements you’ve created. Announcements can include embedded video/audio in the Rich Content Editor using the Record/Upload Media and this adds greater personalisation. See also CANVAS Essentials course in asynchronous page.
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