As you probably want to synch the 3D model too I would just use any cloud service you already have access to. I’m not familar with OneNote but at the University I just created a folder for synching work stuff for all my colleagues on my google drive and we use a simple txt file for communication or the built in program features. Its not a massive suprise that a MS program uses a MS service for synchronisation.
I advice against running the files DIRECTLY in the synch folder though. Sometimes cloud services fuck up if you work for long time on the 3D files and might corrupt it. I have different version numbers (or just make a quick 7z backup archive) on the folders and synch manually. Gives me more control.
I’m inherently suspecious of cloud services as one time they fucked a fairly complicated cad assembly and even the build-in rollback features didn’t work.