While OneDrive for Business allows 1TB of cloud storage, allowing you to access your files from anywhere, there are file naming restrictions that will cause issues to sync your file to OneDrive. In order to experience optimal syncing with minimal issues, please either rename or refrain from using these characters in your filename or folder name.
| Invalid characters – These characters in file names aren't supported when you sync OneDrive for Business | <, >, :, ", |, ?, *, /, \ |
| These file names aren't supported when you sync OneDrive for Business | Icon .lock CON PRN AUX NUL COM1 COM2 COM3 COM4 COM5 COM6 COM7 COM8 COM9 LPT1 LPT2 LPT3 LPT4 LPT5 LPT6 LPT7 LPT8 LPT9 _vti_ |
| These folder names aren't supported in OneDrive for Business | _t _w _vti_ |
For more information, please visit this Microsoft article on filename restrictions.
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