The best way to open a notebook that’s saved on SharePoint is to use the free OneDrive app that’s available in the App Store.
Once the app is installed, follow these steps to open the notebook:
From the OneDrive app, tap the notebook you want to open.
Tap , and OneNote will automatically open the notebook.
Note: Your organization may require you to setup a VPN connection on your iPad or iPhone to access SharePoint notebooks when you’re not connected to the network. If you’re having trouble accessing a SharePoint site, this might be the cause. If you’re not sure if you need to use a VPN connection, please check with your network administrator.
Sign in to an Office 365 SharePoint site from OneNote
To open a notebook on an Office 365 SharePoint site, do the following:
Tap Settings, then tap your account name.
Tap Add a Service and then tap SharePoint.
Enter your email address and password and tap Sign In.