New beta update 4.2.6 enables counters in photo kiosk mode. You can use counters to track uploads and prints, and actions like notifications, disabling printing, or closing the kiosk when counter limits are reached. Counters can be viewed under Settings > Counters, or by pressing ctrl-4 from the main screen. To learn more about counters watch our short tutorial. See release notes.
You can download the beta below. Note: this beta also include the new green screen feature.