Saving and importing Studio audio file?

Hi Shana. Welcome to E-Learning Heroes! Glad you're enjoying Articulate Studio. Hopefully you'll find the resources here helpful for getting up to speed on Storyline as well.

Articulate Studio cannot be published to MP4 format. However, Articulate Storyline 360 does give you the option to publish to MP4. If you have access to Storyline 360, you can import your PowerPoint file and then record audio narration by clicking the Insert tab, selecting Audio, and then Record Mic. The audio recording process is very similar to Articulate Studio.

To sync the recorded audio with any slide animations you may have, just drag the audio on the timeline to position it. And once you've got it working the way you want, publish it to MP4 by selecting Publish, and then Video.

Here are some tutorial links that expand on the steps I've highlighted above.

Storyline 3/360: Importing PowerPoint Slides
Storyline 3/360: Recording Audio Narration
Storyline 3/360: Syncing Animations with Audio 
Storyline 360: Publishing to Video

If using Articulate Storyline for this project just isn't an option and you need to upload a SCORM package to Canvas LMS, you may find the community pointers in these links helpful:

Publish Setting Studio 360 to Canvas
Articulate in Canvas

If you're still not finding the answers you need in the above discussions, you may want to reach out to Canvas, directly, for some support.

Best wishes on your project!