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The treeview in IPP3 has folders representing Categories of Generators. I see no obvious way to add/modify/delete these, either in the interface itself or in the manual.
nm, just figured it out. ha "Within that Generators directory, the individual generator files are then stored in directories based on their category."
HOWEVER: If I create a top-level folder with several sub-folders, they show up as expected. If I then create a Generator file in one of the sub-folders, it shows up in the top level folder.