Samsung Galaxy S6 edge G925P User Manual page 211

2. Tap a picture you want to add to a collage.
3. Tap Edit > Collage.
4. Tap or Add to select additional pictures for the collage.
Tap pictures to select them.
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Tap Done when you are finished selecting.
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 Your collage layout will be displayed.
5. Use the tools at the bottom of the screen to adjust your collage.
Aspect ratio: Adjust the aspect ratio of the collage.
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Camera and Video 200