The Publish To Folder pulldown causes the HTML to be generated into the folder identified in the Publish Preferences menu. How many HTML files are generated is also specified in the Publish Preferences menu. In addtion, files specified in the Publish Extra Files menu are also copied to this directory.
The "About the Generated Files" page describes the files that are actually generated and how to link to them from an another web page.
If there are errors doing the publish, you will get popups with the error. If the publish to the folder works, either as the final target or the intermediary to an FTP, you will get a popup similar to the following: