ES Explorer was an amazing tool that let me load USB drives via OTG. With the update they have added an eject button to the left side navigation panel when the USB stick is recognized. The problem is that when you use the gamepad to navigate down to the usb stick and select it, the eject button is activated. There is no longer a way to load the usb stick. I've emailed the dev with no reply - maybe this will some how get his attention
I use the google drive support.