One of the big problems I’ve always had with DAZ Studio is the inability to load my saved Render presets. It’s easy enough to save them: File | Save as… | Render Settings. They are placed in the ..\content\Presets\Render folder as .DUF files.
But then they never ever show up in the Presets tab. This problem has always been there, across multiple different versions of DAZ Studio and even across different PCs. To try to solve the problem, one can copy the render preset files into every possible runtime and content folder that DAZ has access to, but still… nothing will ever show up in the panel. I assume it’s a bug.
The workaround solution is to manually find your presets in Windows Explorer and then drag-and-drop the required .DUF preset file directly onto/into the scene in DAZ Studio. With the Editor open in the Render Panel, you can see the settings change ‘live’ as you drop the .DUF onto the scene. But it would be so much easier just to have them show up in a list where they’re supposed to be.