OTG problem with flash memory

hey guys.sry for my bad english...
I have this problem:
My phone(Note 3 - N9005) doesnt read flash memories.when I connect otg cable,the "usb connector connected" message shows up,but when I attach flash memory to it,nothing happens.It has no problem with computer mouse or keyboards and they work fine.
I tried different otg cables,flash memories,roms,format of flash memories and kernels but no success...
The weird thing is when I connect OTG to phone n them attach a USB 4 port Hub to it and connect the flash memory to usb hub,phone reads the flash but when I connect Flash memory directly to OTG,phone doesnt read it
plz help me.It really pissed me off :@

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