In Add File, there's no (graceful) way to back out of the upload a file dialog

In Job Designer, when you click Add File and try to type into the Files field, you are instantly dumped into an "Upload a file" dialog and there's no cancel or back feature (that I can find...). Only way to get out of it is to use the browser back button and lose any other properties you've already entered.

(or actually go through with uploading a file and then deleting it if you don't really want it.