How to use native android file-open-dialog in Unity?

I’ve seen this dialog to pick/open a file on android in some apps and it seems to me as the native one. But I can’t find a way to use it in my own apps. The language of the attached screenshot is German, but I’m sure someone will recognize it.
Screenshot of the file-dialog

in Unity3d its possible open native file Dialog in game with Unity3d c# code? Thanks for your guide.

I have found the solution to my problem and I want to guide others who have this problem Go to the site below and use the free plugin. Unity Native Gallery Plugin

I am no expert on android, but I think the solution will be similar as for Windows native ‘open file’ dialog
-There is no such thing directly supported by Unity, because it’s very platform-specific. So in order to do this in Windows, you’d have to explicitly find an external method in the windows .net api and call that. So if you google for ‘open file dialog’ for android (without Unity), you should be able to follow the same instructions…?