I wanted to report a bug but got stuck at flatpak step 2:

2. Install the unstable version of the app following this link https://gitlab.gnome.org/GNOME/gnome-apps-nightly/raw/master/NautilusDevel.flatpakref and save it as a ".flatpakref" file

I'm not a flatpak expert (and don't want to be), and I just cannot find easily what must I do to import/inject/add this ".flapakref" file to my flatpak installation.

1. Opening the URL with firefox.. just open the file in plain text.
2. gnome-software does not handle it
3. flatpak has no GUI. And its CLI is bad.

Anyway, I think it'd be great to have a flatpak tutorial link with flatpakref file import, or even better some copy-paste-dont-think instructions on how to install nautilus dev version from flatpak directly, so that we can focus on the bug report and not third party tools :).