Insert five screenshots of your iPhone app into Sketch symbols at both iPhone 6/7/8 and iPhone X sizes.
Edit or add to five additional symbols containing backgrounds and captions.
Choose from a variety of iPhone devices to frame your shots (now including "Clay" options).
Command + Shift + E: Sketch generates all the sizes required by the App Store for iPhone 4, SE, 6/7/8, 6/7/8 Plus, and X.
Enjoy! 👊