I have bought two Sandisk cards and found that after re-formatting with my Mac my drone does not see them they worked ok before, it would seem that they need to just have the data deleting and not formatting, I have tried to reformat from the drone but it will not. If the card it in the drone the video is running but will not record or take still photos. Has anyone else had a similar problem and is so got them to work again. They are OK out of the drone.