How do you retrieve a notification that was inadvertently closed?
Then you'll want to contact your school's Canvas admin. They can copy and paste the global announcement into an email for you.
For the most part, you can't. What kind of notification was it?
It was a tutorial / information sheet for "1:1 iPad Classroom Management."
On Thu, Aug 25, 2016 at 11:11 AM, email@example.com <firstname.lastname@example.org
As that's something school-specific, I don't have any idea what kind of notification that is. Was it in a global announcement (visible as soon as you log in)? something inside a course as an announcement or discussion? Does your school have it's own Canvas instance (the URL would look like [schoolname].Instructure.com) or is it Free For Teachers (Url is canvas.instructure.com)?
It was a global announcement, and our school's url is
On Thu, Aug 25, 2016 at 12:01 PM, email@example.com <firstname.lastname@example.org
Retrieving data ...