In the native photo app or camera, we are able to retrieve the cropped section (4:3) in editing if we took photo with 16:9 ratio. However, Darkroom can read the photo in 16:9, the cropped (hidden) part is gone. What I have to do is go back to the camera roll, edit the photo back to 4:3 in other to get back the full size photo. Then I can go back to Darkroom and crop the photo. However, when I export the photo and save to replace the original, the photo loss the full size (4:3) photo.
If not, I need to adjust cropping every photo in camera roll before editing in Darkroom.
I hope the editing between native app and Darkroom can be more seemlessly.