Allowing management of all files (instead of media only) will need to be selected in Settings → Apps → Amber iX → Permissions to backup camera roll photos with location information.
If photos have already been backed up without location information (and you still have the original photos on the mobile device), either delete or change the name of the folder it's backed up to. The default location is in Amber Folder → Home → MyDevices.
Then, go to Settings → Backup & Upload → Camera Roll Backup → Backup Settings → Reset Backup. Re-backup the camera roll and the photos will now have its location information.