OneDrive may show "Your OneDrive is full" or "There isn't enough space on OneDrive" even though your PC has free disk space. Existing files still open, ...
XDA Developers on MSN
I enabled Windows 11's drive compression and got over 60GB back without slowing down my PC
While you're running out of storage space, Windows 11 may be hiding an easy way to get space back without losing anything.
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