The WebInterface has a search window you can open to search with various criteria from the current folder you are in and its sub folders.  The search will look for filenames, and keywords that might have been associated to the file through the WebInterface and display a listing of matching items.

[attachments|search.png]

In this example I searched on a the keyword '7018' to find the image with that number.

[attachments|search_results.png]