Hello, How do you copy files from a Nexus 7 (2 gen) Tablet using a OTG cable to a pen drive ?

[AC Question]

I have tried copying the files using several apps from Google Play but either the pan drive doesn't display or there isn't a copy/paste option. I'm starting to think that it is not possible to transfer files from my Tablet to the Kingston pandrive. Please keep in mind I don't have access to a computer.