Best thing I used is to get the Camsanner App. Take pics of the coin(s) and then edit if necessary. Then save them as you want. Can then open up Camscanner on your PC. DL the pics to your Folder if you want. In either case, when you upload the pics to NGC, its very easy and fast. Quality on camscanner is better than a SLT camera and it allows me to edit my coins with perfect cropping. This app is free but can also be used for a wide range of other documents/pics. As it implies, it scans whitherever you want, edit and save it in a folder you create.
Hope this helps