How do I add an announcement in a course?
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.
Your course must be published for students to receive announcement notifications.
If you import course content from another Canvas course, you must manually enable notifications to receive notifications for imported announcements.