I am trying to display a video using Gtk4 and Haskell but I’m having some trouble doing this.
Here is my code up so far. I have modified the example from https://github.com/haskell-gi/haskell-gi/blob/master/examples/Gtk4/gtk4-example.hs and I now have this.

I’d like to have a button in my application which allows the user to open a file from within the application’s special documents directory. I thought I could use the initial-folder property to set this, but I couldn’t find a way to use it that did what I wanted. Here’s a minimal example that doesn’t do what I expect: