Is this a goofy question? I've been doing a project with 4K source files as a 1080p project then rendering to 4K? Is it actually producing a 4K version from the 4K source files or do the project settings (1080p) limit the actual dimensions to 1080? In other words am I just upsizing 1080 to 4K when I should have been editing it as a 4K project?