USB otg won't work?

I have a 32 gb lte nexus 9. I Tried using three different USB otg devices including a flash drive from Sandisk that plugs in directly, a flash drive plugged in via a USB otg cable and a ps3 controller plugged in using the same cable (I have the sixaxis app). No one of them work. ES file explorer wouldn't detect any storage, neither does the 'storage' menu in settings give any mount option. And sixaxis doesn't detect the PS,3 controller. Any suggestions?

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