MediaWiki currently provides a way to see the edits of a user using the Special:Contributions page (see for example Special:Contributions/guillom). File uploads are registered as regular edits and show in the "Contributions" page. However, this system is not appropriate for media files, which would benefit from a more visual approach, especially for media libraries like Wikimedia Commons. Currently, such pages are maintained manually by some users in a subpage of their userpage.
The proposed implementation would be a new special page like Special:Gallery/username basically working like Special:Contributions, but displaying thumbnails of the media files uploaded.