While the iPhone has a beneficial two-finger drag gesture to select some or all files and other items, Apple barely mentions that capability anywhere, and it's largely unknown. It's fair to call this a hidden iPhone trick because there is no visible way to know it's possible. It's the sort of thing that requires a large amount of reading or discovering this gesture as a happy accident. Once the shortcut is revealed, it might change how an iPhone is used on a daily basis. It's that valuable.
There are often many ways to achieve the same result with an iPhone. For example, pressing and holding a word highlights it, and selection handles appear, making it possible to drag the handle at either end to extend the selection in either direction. A faster way to select a whole sentence is by triple-tapping on a word. Double-tapping selects the word, giving a small taste of the many selection tools available in iOS.
Related: The iPhone's 'Secret Button' Is Finally Getting The Attention It Deserves
Handling long lists can be time-consuming, but the iPhone has a great shortcut to help speed that process up. In the Files app, pressing two fingers on the screen and dragging any direction will begin selecting files. The iPhone's dual-finger drag gesture works in several other apps that show a list of several items. Many of Apple's built-in apps support this batch selection method, including Mail, Reminders, Notes, Voice Memos, Shortcuts and possibly more. Third-party apps can use this gesture as well, and it's part of iOS. By starting with the first file in a folder and making a double-fingered drag to the last, it's possible to choose all files relatively quickly. This also works with the other iPhone apps mentioned above to select
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