The Screenshot Window

The screenshot window displays thumbnails of the nine screenshots taken over the two second span around the time that you clicked the "Take Screenshot" button. You can select a thumbnail to inspect it in the larger view to the left.

Save

Allows you to save the currently highlighted screenshot. You can choose the destination file format from the pop-up in the file save dialogue. .tiff, .jpeg and .png formats are currently supported. iTunes Connect currently allows only .tiff and .jpeg images to be used as screenshots in the App Store.