Jottacloud for Android will monitor for new photos and videos being taken and upload them in the background whenever it is possible.
Doze and App Standby
Starting from Android 6.0 (API level 23), Android introduces two power-saving features that extend battery life for users by managing how apps behave when a device is not connected to a power source. Doze reduces battery consumption by deferring background CPU and network activity for apps when the device is unused for long periods of time. App Standby defers background network activity for apps with which the user has not recently interacted.
Jottacloud for Android is optimized for Doze and App Standby, but background network activity can be reduced in these situations.