04-18-2020 07:50 AM
It only works with a few new models. I have a 1DX III, 1DX II, 1DX, and 5DS R and it only is functional with files from the 1DX III. I haven't found it to be very useful so I don't think you are missing much.
Although the 1DX III uses the same resolution sensor as the 1DX II, processing its RAW files is much more computer resource intensive so a lot changed with what it is doing with files.