I use the Brushes Redux app to stack photos
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Open the app and tap the + in the upper right hand corner.
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Select the iPhone 6 Plus canvas and tap Create
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Tap the small spiked wheel in the lower right hand corner
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Tap Place Photo
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Select your photo and pinch it to size and move it in place. Then tap Accept
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Repeat the process to add and place a second photo.
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Tap the back arrow in the upper left hand corner. Export the project to the camera roll.
in the camera roll use the cropping tool to crop the photo to the desired configuration.
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