Is there a way to refresh a directory in a project?

If I add a file outside the project it doesn't show up in the project directory structure and there is no refresh option nor does the Synchronize button work (because I believe it only works on "existing" files).

Additionally, there's no right-click menu option for refreshing a directory.

Any one know how to have Intellij either manually or automatically monitor a directory for new files?

Thanks,

--a