iCloud sync
From the app’s English Help & Guide · Reference release 1.0.3
iCloud Sync mirrors Documented data across devices signed into the same Apple Account. It is off by default because evidence data is sensitive and some people share an Apple Account or device.
Sync details
When sync is active, More → Data shows the current iCloud state. Open Sync details to see the requested setting, the store active for this launch, recent changes sent or received, and the most recent issue. Documented reports only activity observed on this device; it never claims every device is fully synced.