View this video at https://macmost.com/an-introduction-to-the-iphone-preview-app-in-ios-26.html. A big new feature in iOS 26 is the Preview app. As Mac users already know, Preview is much more than just a way to view some files. You can also use it to fill out PDF forms, split and merge PDFs, edit images, and annotate both PDFs and images with markup tools.