Executive summary: P3S can NOT use SDXC cards. P3S only supports up to and including SDHC. Hope this helps others who are likely having the same problem I've had. I have a P3S. Attempted to use a SanDisk Ultra microSDXC UHS-I 64 GB.P3S can NOT use SDXC cards.Yes according the P3S manual it should work, but it does NOT work. Events New card out of packaging, P3S says invalid. Placed card in DSLR camera, works. Placed card in digital video camera it works. Format card using DSLR, in P3S does not work. Format card in digital video camera, in P3C does not work. Format card in Windows 8.1 exFAT 128k allocation units, P3S does not work. Format card in Window 8.1 exFAT 4096 allocation units, P3S does not work. Call Dji, half hour later conversation ends with "Dji does not support 3rd party products." WTF!!!! Ok, kept my cool and asked if they could sell me a supported SD card. Response "Dji does not sell memory cards." WTF!!! Ok, not worth getting worked up over. Chalk it up to another company with lousy customer service. Purchased microSDHC UHS-I 32 GB. Guess what? It works!! Bottom line whoever wrote the Phantom 3 Standard manual did a bad job, whoever proof read the manual did a bad job. And technical support doesn't have a clue. Did I say I was frustrate? Ok, take a deep breath but I will recommend anyone thinking about buying a Phantom 3 might want to reconsider.