I'm trying to render out a 16K image from TM but for some reason the option is greyed out, I'm not using RT it's just a standard image, is there something I need to do? I've logged into epic as well to ensure it wasn't the issue.
To export at 16K resolution, you need to expand the Details section below the resolution settings and enable Tiled Rendering. This will allow you to select the 16K option or set a custom resolution higher than 9000x9000.