Can't access the photos

Hi, I can’t see the photos from dropbox in my wordpress admin. When I click on “Sideload these images” button nothing happens. The image: https://www.dropbox.com/s/wfwyn88jldh7i05/dropbox.png?dl=0

Thank you very much!

https://www.ads-software.com/plugins/dropbox-photo-sideloader/