Many edit edit pages, such as those for plugins, require you to enter a file name - usually with a path - into a text box. If you don't know the exact path/file you have to leave the edit page or go to another window to find it. Then you have to return to the window with the edit form and type or paste it in.
I want to be able to browse - right from the specific field - to pick the file name. Another option would be to select it from a dropdown list on the form.
If the feature is not available in WordPress itself, or in a third-party plugin, I'd like to see another plugin that can add this in.