SD  card  is  very important to  the  streaming quality.

32gb  is   about the  highest  the  system  can handle.   

I'm running  a  PNY  turbo performance  micro SD...   32gb.

Don't forget to format  the card either,    FAT32   is  what you want..  and don't forget to  'eject' the card  when done  formatting. 

Tons of  help on  www.yuneec-forum