I am trying to save to my network drive (K:, O:, P:, U:, etc.) and I'm getting an "out of disk space" error. I've checked the drive properties and it shows plenty of disk space left.
The disk allocation listed is for the entire drive, and not your allocation size on that drive. You can clear off space from that drive, move files to OneDrive, or raise a request for more disk space, if available.