A recent updates to Microsoft’s OneDrive cloud storage solutions will change how it works a bit; from now on your OneDrive folder must be stored on a drive that is formatted using NTFS. NTFS is the default format used for hard drives when you set up a Windows machine, but some users with smaller internal drives may set up OneDrive to sync to an external hard drive or SD card that may be formatted with FAT32 or exFAT. In this case OneDrive will stop working until you move your folder.
If you have run in to this issue and need help moving your OneDrive folder or converting your storage to NTFS, please feel free to let us know!
Source: Ars Technica