How to Edit a Photo Collage in the Picture Postie App. Editing your photo collage is quick and easy with Picture Postie, allowing you to fine-tune your design before printing. Whether you want to swap images, adjust cropping or refine your layout, everything can be done directly from your phone in just a few taps. Picture Postie will print and ship your personalised photo gift Australia wide. We're Australian made & owned and have been bringing photos to life in print for o