Version 1.0.1
This statement has been modified on January 6, 2019.

Both the Windows SyncFolder app and the Android and iOS SyncFolder Photos apps don't collect and don't use any personal information...

Certain versions of the apps can however generate log data for events that occur inside the app. The apps place such data in log files with the purpose to track down possible faults that might occur inside the apps.
The log files are never collected unless you, manually, send them to us.

So simple :)