OneNote Free App for Mac - Syncing notes from local to online (no notes on OneDrive)

Hello there,

I own a copy of the OneNote free App from the App Store for Mac, and have some notebooks locally saved on my Mac. I'm trying to save them and upload them online, since their counterpart "brothers" (the OneNote files usually kept on OneDrive) are no longer there, probably eliminated. It's seems easy to say, but with the free app there aren't those many commands to allow you to export your notes.

Do you please, own a solution for that?

Thank you,

Gianpaolo