EOS C100 Unable to assign up, down, left, right functions to other buttons

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Hi. Trying to assign the first 5 buttons to function as the joystick (so i can get rid of the side grip) but for some reason i can't see the up, left, down etc function on the assign button menu (they actually should be at the end after 'Initialize Media'). I've checked the firmware and it's up to date. Anybody have any recommendations?