Remote Storage on Zebra Utilities App iOS

I'd like to know how to get the iOS app, "Zebra Utilities" to utilize the Remote Storage option.

There is a screen within the app labeled "Remote Sotrage"  - within this screen there are these options:

 

Remote Storage On / Off

URL

User Name

Password

Domain

 

Please let me know how to setup this screen to access remotely stored files.  Also indicate what type of files are supported (jpg, pdf, zpl..etc)

 

I've attempted setting up locations on my webserver that contain images, however, the app always says "Failed to connect" - even when URL directory doesn't have any protection and is accessible to the world.   Perhaps this URL needs to be a box.net or dropbox account?

 

Please help.