Hi there, @AbigailKim ...
I don't see any major issues listed on the Canvas Status page for today: Instructure Status.
If you are still having issues, you might want to contact folks at your school who work with Canvas on a daily basis. For example, I spent a minute or two browsing the UC Riverside website, and I found the following Canvas support page:
Canvas Support Center | Canvas
If they are unable to help, you might be able to reach out directly to Canvas Support via the "Help" icon which is located in Canvas on the far left-hand global navigation menu. Depending on what level of support UC Riverside has purchased from Instructure (the folks that make Canvas), you may or may not be able to contact Canvas Support directly. But, the UC Riverside Canvas administrator(s) should know what kind of support they have with Instructure.
How do I get help with Canvas?
I hope this extra information will be of some help to you.