Feature summary (what you would like to be able to do and where):

Please add a search filter that allows to see files uploaded by a particular user.

Discussion and context here.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):

There are many use-cases of this such as checking for copyvios or vandalism, replacing a batch of files, or in my case for reuploading videos that were imported below resolution at the source via video2commons. It also allows seeing galleries of files uploaded by a user via the MediaSearch which is what this gadget and categories like this are about which are also useful. There are probably many use-cases for this one can't easily think of now.

The file uploader is a universal thing available on any MediaWiki wiki so this is only about making this data available to the search, for example via a search operator upload:"username".

Benefits (why should this be implemented?):

See the use-cases. The uploader (different from the files' author which is in the Information template) can't be used in the Wikimedia Commons search so far.