i have connect 8 gb usb with android its working but i cant download large size app " Storage error"

[Msarfraz]

sony 8 gb storage is working and have been mounted by android but when i download any app of large size . it give error " app need External storage "

 

[hang-the-9]

Most apps can't be installed on external storage, and the issue may also be that you are using USB and not a built-in card reader.