How To: Save Space by enabling On Demand Sync for One Drive in Windows 10
Microsoft has confirmed the return of placeholder files for Windows 10 with the On Demand Sync feature in the Fall Creators Update.
On Demand Sync enables users to see all of their files from OneDrive, without downloading them to their local PC. This is similar to the functionality that was originally in Windows 8.1 - OneDrive creates a local 'placeholder' file that represents a full file
The placeholder file takes up practically no space on your local PC until you download the full version. Users can specify files or folders that they will always prefer to download and other files and folders that they prefer to leave in the cloud until needed.
If a user is offline, or has no internet connection, OneDrive will understandably not be able to download the file.
Windows Insiders who have been using the feature for several months might notice that their hard drives started filling up recently as the feature temporarily disappeared when they receive the final Fall Creators Update build. Here's how to resolve that:
Why don’t I see the Files On-Demand options in OneDrive settings?
If you aren't seeing the Files On-Demand options, the latest version of OneDrive hasn't rolled out to you yet. Here's how to get the latest version of OneDrive.
Make sure you're running Windows 10 Fall Creators Update (version 16299.15 or later).
Download and install the latest version of OneDrive that's rolling out with the Windows 10 Fall Creators Update.
Restart your computer.
After your computer restarts, select the Start button, search for “OneDrive”, and then select the OneDrive desktop app.
When OneDrive Setup starts, enter your personal account, or your work or school account, and then select Sign in.
Right-click the white or blue OneDrive cloud icon in the notification area, at the far right of the taskbar, and select Settings.
On the Settings tab, select the Save space and download files as you use them box.