First, you'll need to set up your network drive to sync with OneDrive. This involves installing the OneDrive desktop app on your computer and selecting the network drive folder you want to sync within the OneDrive settings.
Once your network drive is synced with OneDrive, you can then connect OneDrive to SharePoint. Simply go to the SharePoint document library where you want to sync the content from OneDrive. From there, you'll see an option to "Sync." Click on that, and it will open your OneDrive application. Confirm the synchronization, and your OneDrive folder contents will be mirrored in the SharePoint document library.
This setup ensures that any changes you make to files in your network drive will be automatically synced to OneDrive, and then to SharePoint, keeping everything up to date across both platforms.