In Canvas there are three separate file spaces that students may have access to.
Course – All students will have access to course files if the instructor allows it. In some courses instructors may turn off the files link in the course navigation.
Personal – You have a personal private file space that can be accessed via the Account link in the global navigation. In the personal Files you can rename, delete, organize, and upload files.
Group – If you are enrolled in a course group, you will have access to the group files. All group members can rename, delete, organize, and upload files.
By default, each user has 50 MB of storage space in Canvas