Microsoft rolls out a new capability which enables administrator to automatically mount / add a specific SharePoint Team Site Library being synced for users (cp. M365 Roadmap).

Configure SharePoint Team Site Libraries Auto-mount
To configure the auto-mount you need to configure a group policy which configures the users OneDrive sync settings. (cp. link “Configure team site libraries to sync automatically”)
Prereqs, requirements and limitations
Please note that there are certain prereqs, requirements and limitations before you can start.
- Windows 10 1709 or later
- Library must have below 5000 files/folders.
- Not for 1000+ devices
- Sync is applied next time the user signs in but it can take some time until the sync starts.
- A user cannot stop the sync.
- You need the OneDrvie GPO Template (OneDrive.adml, ..admx) in your central GPO store (e.g. erik-klefeldt.de\sysvol\domain\Policies\PolicyDefinition) …
- This might be subject to change (June 2019).
Configuration steps overview
- Create a new GPO
- Configure the GPO based on your needs, applied to a OU and add WMI-filtering for a more granular scoping, if needed
- Add the SharePoint Team Site Library ID to the GPO
- Verify that the GPO is applied
- (Verify the reg key [HKCU\Software\Policies\Microsoft\OneDrive\TenantAutoMount]”LibraryName”=”LibraryID”)
- Verify that it syncs on the devices
Conclusion, opinion and summary
Easy to configure, isn’t it? In my opinion it might help you to move and simplify a migration from legacy files shares to SharePoint Online. It enables you as administrator to manage a smooth transition from file shares/services towards SharePoint Online and really adds a convenient way and comfortable user experience because your users do not need to manually add the library to their OneDrive sync and “map” the SharePoint Online Team Site Library on their device.