OneDrive File Sync
Follow these steps to set up local file synchronisation with SharePoint.
When first logging in to OneDrive, the flow may ask if you want to sign in only to this app or to the machine. Ensure you select No, sign in to this app only, as in the following image.
This happens when you are using an unmanaged device, and does not change the file synchronisation
After this you may receive the following error, which can be ignored. Choose Next to continue.