Access file system

Hi everyone,

I was trying to setup a small experiment, where I want to replace a native Unreal based app with a WebXR based application. Most of its features are around 360˚ video which works quite well. But I am struggling to access local files from the file system. The "old" app has a dedicated directory which includes lots of video files. And now I would like to access those files from the WebXR / PWA app. Any ideas on how to do that?

I tried the File System API, but it does not seem to be implemented in the default browser.