iOS’ Files app is one of the best new features in iOS. It lets you move files from app to app almost as easily as in the Mac’s Finder. The problem is, not all apps support it. To use an app with Files, that app needs to either accept files dragged onto it via drag-and-drop, or it needs to integrate the Files picker.
But you can still use Files with some older apps, or apps from developers who don’t want to add support: Many file-based apps will open up a web server to let you load stuff in via a browser on a Mac or PC. We can exploit this old-fashioned workaround with a workaround of our own, effectively adding local Files support. And don’t worry, it’s dead easy.