Each time you take a photo with Arsenal, the original image is saved to your camera's memory card. The device also sends a preview image to your Arsenal mobile app. The app uses these images to generate previews of exposure stacks, focus stacks, and long exposure blends. You can save or share these preview images from your phone.
In the future, Arsenal will also process stacks directly on the device and save a full-resolution image to the camera's card (when supported).