Launch Scanner Mini, press plus icon and tap the picture button on the bottom toolbar to access Photo Library.
Select images from the Camera Roll and choose the processing type: Photo, Document or Greyscale using top toolbar and press Done. Tap on the page to edit or retake scan. Tap Save to finish with this file, or tap Discard to delete it.
Note: Scanner Mini won't display panorama photos and photos with high resolution imported from other devices.