I use a 64 GB Samsung Class 10, UH3 Micro SD card and it works just fine. However, I discovered a weird thing about using this card. When I formatted it, there were only two choices, exFAT and NTSC.
When I take still photos, it has a time stamp that is 8 hours earlier than the actual time I took the picture. It also shows the current time, less the one hour that Yuneec has never gotten fixed. When I take video, the only time it shows is the 8 hours prior to the actual time when the vi deo was taken.
Otherwise, the card is just fine.
I also use a 32 GB Micro SD card that does display the actual time when taking either still or video, minus that one hour that we all have lived with since getting our Typhoon H copters. When formatting teh 32 GB cards, it has three choices: FAT32, exFAT & NTSC.
Just something else to ponder about, but no flight problems in either case.