What can I do if I'm cannot select a photo on iOS?

If when clicking Select Photo, the button just flashes rather than opening the photo picker, then the access to the photo library has been disabled. To remedy this for iOS, the following steps should be performed:

  1. Open Settings
  2. Choose Privacy & Settings
  3. Choose Photos
  4. Choose Fixle
  5. Change “Photo Library Access” to “Full Access”