Downloads Folder Question

Weird situation. When I download something using Chrome, it shows up in the Downloads "app" which I assume is just a folder. I can also see the Download folder in ES File Explorer as well as the file I downloaded.

Now if I copy another file to that folder, I see the file in the Download folder, but it doesn't show up when I click the Downloads "app" - only the actual downloaded file shows up.

How can I get all the files in the Download "folder" to show up in the Downloads "app"?

Thanks