This guide for IOS devices explains how to use iCloud backup features, to backup your Flow Mobile Surveying photos.
Using Android? Read how to backup your Photos on Android
Enabling Automatic Backups
Your photos will appear in a folder named Flow Mobile.
These can be backed up with iCloud backups or iCloud photos:
NOTE: Photos saved to the gallery do not take up any additional space on the device, however, they do contribute to the user's iCloud quota if backed up.