The Files Dashboard can be accessed in your regular dashboard, in it's own tab. This view allows you to see all the files you have in one place, rather than viewing files for one project at a time. You can customize columns in this dashboard to have more information visible if needed.
Default views are documents and photos and from there you can apply filters to narrow your search as usual. You can click on a file name to download and view the needed file. Note that all these files are still accessible in their respective projects.