On my first flight with my MA2 I did a short flight to see if everthing was working. All seemed to go smothly. I uploaded the short flight to airData. I shot a short video with the setting on 4k zoom 25fps. I had a warning in the airdata program stating "sd card slow" on two ossasions.
My card discription is:
SanDisk 64GB Ultra microSDXC UHS-I Memory Card with Adapter - 100MB/s, C10, U1, Full HD, A1, Micro SD Card - SDSQUAR-064G-GN6MA.

What card speed or style should I be using? Video downloaded to the card just fine on that flight.

Exreme or better Extreme Pro

Hello there JimDandy. I am sorry for the trouble this has caused and thank you for reaching out. For reference I will post the list of supported SD Cards for the DJI Mavic Air 2. Thank you.