3.6.1.4 Per DownloadFile

SyncId: An identifier of the file, in the format specified in [MS-FSVCA] section 2.1, that is used to correlate the change batch information from the underlying Sync Framework.

ConcurrencyInfo: An opaque stream of bytes that identifies the file version. ConcurrencyInfo MUST be in the format specified in [MS-FSVCA] section 2.9.