Check whether you have media content (audio and video) stored in the course.
This takes a great deal of space, and should be stored and displayed using Mediasite, not directly in Canvas
Also check whether you have uploaded PowerPoint presentations as .pptx files.
These should be stored as .pdf, which requires far less space.
If you still need more storage space, contact the Canvas administrator by means of the “Help” button in the menu on the far left.
Contact the teacher or administrator, who can go into SpeedGrader and delete submitted documents there.
Example: Incorrect file handed in as a group assignment, new file submitted immediately afterwards, but the first (incorrect) remains among the files in the folder. Using SpeedGrader the teacher or administrator can select from a roll-down menu the different files uploaded at different times and delete as necessary.