How do you do an audio recording in canvas?
You can create an audio recording within the rich content editor by clicking the media button and then turning off your camera before you record. Here's a more detailed guide on how to do that: How do I record audio using the Rich Content Editor as an instructor? This guide says it's for instructors but it's the same method if you're a student too!
If you're trying to upload a media file for an assignment, then this guide will explain how to do that: How do I submit a media file as an assignment submission?
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