Apple’s big iOS 26 software update for 2025 has now reached millions of iPhones, and brought with it a bunch of new features and an updated visual interface. If you own an iPhone, you’ll also find there’s a new app: Preview. However, iOS 26 marks the first time that it’s made the jump over to the iPhone—and considering how useful the app can be, it’s surprising it hasn’t happened before. Its simple purpose is to make it easy for you to quickly load up images and PDF (Portable Document Format) files. It’ll also spring into action when you tap on a compatible file in various other apps, including the Files app.