App says "SD Card Unsupported" and "Read-Only SD Card."

Wireless Memory SanDisk Connect Wireless Stick
6

Trick here to get it working is 

  1. Power off the USB drive 

  2. Format the USB drive

  3. Power on the USB drive 

Windows format with Fat32 and Allocation Unit size 16 KB worked for me. 

If you format while the drive is powered on, it will not work.