@TriciaGoldberg , I'm sorry this is happening. The Canvas system supports file uploads much bigger than 59MB, so the issue is at another point of the process. Likely it is between your internet connection and the browser. I am not familiar with Kaltura to know if there is a file size limit for submissions to that system (could it be an assignment setting?).
If you haven't already, please alert your instructor. It is possible your classmates face similar challenges. Then I would contact your college's support center for students, as they also might be aware of challenges and can direct you to available resources.
