When I share a Dropbox link to a folder with photographs, the web link is not optimized for photo viewing on any platform (phone or desktop).
The thumbnails are too small and compressed. And on a phone's web browser, users can swipe through individual photos, but it requires two separate taps, thereby quickly becoming cumbersome.
I am suggesting the idea to have Dropbox photo folders appear as a dynamic, tiled gallery, much like on a dedicated iOS or Android app.
Google Drive's photo gallery is a great example of how to implement such a feature on Dropbox.