Unable to import notebook from my desktop "MAC"

I recently switched from a Windows PC to a MacBook Pro at my job. It's been extremely difficult to try and get my notebooks imported to onenote on my new mac. For someone reason, I don't see any feature that would allow me to import from my external drive/desktop. The only option I get is to import from onedrive but being that there are so many firewalls on the network, this makes it even more impossible. PLEASE HELP!!!