Yesterday we had a training for our damage assessment app and, quite literally, iPhone users began having problems all at once when uploading photos they had already taken from their iPhone gallery. A user had already completed two training surveys with images from his gallery and he started receiving the Code 400 error on his third survey. After that, other iPhone users started receiving the Code 400 error when accessing photos from their gallery. This started happening around 10:45 yesterday morning - not sure if there was an update or something at that time.
Android and computer users do not have a problem. On the apple devices, photos can still taken or added from folders other than the camera gallery - we found a work around of taking screen shots of the photos already taken and then adding the photos from the screenshot folder instead of the gallery folder.
Any idea what is causing this? The survey is a public survey and it is training but we have an identical survey to it which is the real world survey. We are currently in the middle of a disaster and performing damage assessments daily - any help or advice would be greatly appreciated.