Well, I guess I would need to add an option in the app to share clipboard content.
You know what? You just gave me an idea, a very good idea. Sometimes there are things that are not in file managers, maybe in a particular app, maybe in a browser, and you just want to drag and drop it. I don't like the idea of opening the app, right-clicking on the corners of the window just to enable "keep this app on the top" so that you can drag and drop whatever you want.
Instead, what I would like to see is a keyboard shortcut where a small window opens that stays on top of all the other windows. That you can drag and drop anything to it, or maybe copy-paste anything into it. Maybe a photo, maybe a video, maybe anything. This would work for clipboard content, for video files from other apps that are not file managers.