Dynamic File Services uses the .NET Framework, which has length restrictions for folder paths and file names. It allows a maximum of 248 characters in a folder name. The fully qualified file name must be less than 260 characters. For information, see Long Paths in .NET in Microsoft Developers Network Blogs. If a file’s folder path or fully qualified file name is too long, the Policy Engine cannot move the file during a policy run, and logs a PathTooLongException error.