On: Dropbox' Public/ folders will be phased out soon

[celalo]

Well actually,

https://photos-5.dropbox.com/si/xl/Y-dAUouiiTV2IbOuAMZKe2t7k...

I am not sure if it could work at all times, but you can check for the URL of the picture within the new-style dropbox page.

Which is of course not same as Public folders.