When you have been working offline and re-connect to the Cloud, the Primavera Cache Service generates a log file of the data that was changed when the local cache database was synchronized to the Cloud Connect database. You can view the Sync Reconciliation log file in you temp directory (for example the AppData\Local\Temp folder for your user profile). The file name of the log file is SyncReconciliation<TimeStamp>.log (where <TimeStamp> is the date and time the log file was created).
Alternatively you can view the file from the system tray by right-clicking on the P6 icon and selecting Sync History Report. The file provides a table-by-table report of each change made, including where and how the data was changed as well as reporting on the state of the data in the server and locally after the synchronization.