Your Canvas course shell will only contain some standard syllabus information. If you want to reuse materials from a previous semester, you will need to import that content. If you want to use another instructor's Canvas course content please see Requesting course content from another instructor using the CRS.
See How do I copy content from another Canvas course? in the Canvas Guides for further guidance.
To upload content from a site used at another university, see these instructions.
Canvas campus and vendor resources