URSA Mini Pro LUT Issue

I am trying to install a custom LUT onto my URSA Mini Pro, however when I go through the installation process, it doesn't save onto the camera.
I have installed other LUTs, but I have noticed some don't install while others do. I've read on another post the file must be under 1.5MB, and the LUT I created was ~116KB. I may be doing something incorrectly, does anybody have a solution?

Thanks!