Bluetooth and PB912

Hello I tried to use the bluetooth with PB912 for transferring files from my smartphone to PB912. But a curious thing happens: the PB912 create a folder "Received" and if I browse to the folder I do not see any files. Instead, if I connect via USB to my PC and surf the PB912 in the previous folder I see all the files I downloaded through Bluetooth. Can anyone help me to solve this problem. Thanks

sorry for my bad english !