Files on-demand downloads only the file you need, when you need it.
Windows
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Open OneDrive settings (select the OneDrive cloud icon in your notification area, and then select the OneDrive Help and Settings icon then Settings.)
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Go to the Sync and back up tab and expand the Advanced settings.
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Under Files On-Demand, select either Free up disk space or Download all files .
macOS
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Click the OneDrive cloud icon up in your Menu bar, click the three dots to open the menu, and select Preferences.
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Go to the Preferences tab.
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Under Files On-Demand, select either Download files as you use them or Download all files now.