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  1. After creating and editing your collage, you can save it to your photo album by tapping the Export button in the bottom toolbar on the right.  
  2. Choose Photo Album, and this will generate an image and save it to a folder named "PicStitch".  
  3. From your Photos or Gallery app, make sure you show Device Folders to be able to see the "PicStitch" folder.

As a shortcut, you can also long-press on the Export button at any time to save directly to the PicStitch album.