Files and images get a "friendly" URL -- you tell it in the Edit portion of the Asset screen -- and an "unfriendly" url that is stored in the uploads directory defined in webgui.conf [your.domain.conf]. That directory must exist, must be chowned with the user under which apache runs (www or nobody or apache), given write permission by the user, and *may* need to be symlinked -- ln -s /path/to/uploads /path/to/DocumentRoot -- under DocumentRoot.

To reference this file or image, you would use /\FileUrl(/friendly/url); exactly where you would type /path/to/file. If you'd like to simply include the file or image as is, then you'd use /\AssetProxy(/friendly/url);
--
Maintainer of an unofficial WebGUI FAQ Please contribute questions or answers!
_{When asking questions on this forum, please indicate (at least) which version of WebGUI you are using. Optional, but sometimes helpful, are your Operating System name and version, PERL version, and Apache version. The little icons next to my picture indicate my IM status. Yes, you are welcome to IM me. I am not an employee of Plain Black. My offers of assistance are subject to the general disclaimer of this discussion board that my answer may be completely wrong. Have a great day!}
U2U crythias on #webgui on irc.freenode.net