You can search on Unsplash via photos, collections and Usernames using out search bar function.
To locate a photographer, type their name into the search bar. Once the results show you can narrow the search by clicking the ‘User’ filter tab.
Here’s a quick screencast walkthrough: https://cl.ly/d6edd3c9fead
We do not currently support searching via the downloaded filename, however all filenames have the photographers name included which you can use to locate their profile as shared above.