Jennie,
You didn't say if you are are a teacher or student, but the process is actually the same in both cases when using the Rich Content Editor. Here is a guide page How do I upload a video using the Rich Content Editor as an instructor?
If you have to be a student and are doing this as an Assignment submission, here is a different guide page more specific to that https://community.canvaslms.com/docs/DOC-10668-421254356
Hope that helps,
Rick
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