Load in your effects

The annoying thing about loading your own Custom LUTs into the Colour Lookup Adjustment is that they don’t automatically stay there for use in the future. So you need to open the LUT folder on your drive and copy the Cube files in there. In macOS, look in Applications/Adobe Photoshop/ Presets/3DLUTs; in Windows, it’s C:\Program Files\Adobe\Adobe Photoshop\Presets\3DLUTs.