Why can't I access the USB thumb drive with my Tab 2?

[AC Question]

can't access USB thumb drive with tab 2

I have a Galaxy tab 2 GT-P5110, Android version 4.2.2, a 3 in 1 OTG connector & 2gb thumb drive.

When I connect the OTG I get message 'USB connector connected' but I can't find the files or the USB thumb drive anywhere, I have looked in files in apps, tried ES file manager but no access to drive anywhere

Am I missing something or can't the tab 2 read USB?