If you modify a resource (learning activity) in Canvas that was previously shared to Commons, you can share the modified resource to Commons again to update the existing resource in Commons. Only the user who originally shared a resource to Commons can update resource content. However, administrators can edit resource details.
In Global Navigation, click the Courses link , then click the name of the course .
In Course Navigation, click the feature area link where the resource exists that you want to update.
If you modified a course and want to share it to Commons as an update, navigate to course Settings.
Note: When updating a file, if you change the file name, Commons might not be able to match it with your existing resource.
Locate the resource  and click the Options icon . Then, click the Share to Commons link .
Commons will automatically check whether or not the resource can be updated and create a default option. To manually choose whether or not the currently shared resource is an update to a previously shared resource, click the update toggle.
Commons will verify the best match for which resource you are updating. To change which resource you are updating, click the Change button.
A list of previously shared resources is pre-populated for you. To update a resource, click the radio button next to the desired resource.
In the Version notes field, let users know what you updated. Version notes will be visible to users on the resource details page.
When you are ready, click the Update button.