A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Hi Corinna,
Given your description, the audio seems haven't been synced to cloud. In this situation, I'd like to explain that there is no official method to restore this audio from your Mac. OneNote for Mac stores notebooks in cloud, even we can find some cache files on the local drive, we cannot directly open and restore them.
Thanks for your understanding.
Tim