Perhaps because 200GB is far above the max SD card size of 64GB stated by DJI. Even so, 128GB cards are known to work, but 200GB may be pushing too far beyond specs.All firmware is up to date. Try to format my SD card in the GO app. It goes through the motion then "Reformat Recommended" pops right back up. I'm trying to use a Sandisk 200GB Micro SD. Any ideas?