Canvas Commons is repository that allows sharing and reuse of educational resources. You can link to Canvas Commons content in your courses or publish your own content to Canvas Commons to share with others.
Import content from Canvas Commons into an existing course.
Log into Canvas. Click on the Canvas Commons link on the bottom left of side of the navigation.
(Anywhere in Canvas you see the Canvas Commons logo 
will get you to Canvas Commons home page)
Search Canvas Commons and select content to import into your course.
Use filters to narrow results down
Filters include content type, education level, or internally shared vs. shared w/ entire commons.
Select your desired content to view details. On the right side, select which course to import it to and click on “Import into Course”
Select your course and import.
It may take a few minutes for content to populate into you course, but once complete, you are free to use the content in your course. Be sure to take note of any licensing restrictions noted in the details, and be sure to including proper attribution when appropriate.