Thanks for reaching out. Just to verify, were you able to successfully setup the Auto Upload on your HERO6 Black camera? To check this, swipe down on your camera's touch display, then tap Connect > Auto Upload (if you don't see Auto Upload, it has not yet been configured).
You'll need a charger with an output of 5V 1A (5V 2A maximum) to use Auto Upload. Also make sure that you're within Wi-Fi range. The Auto Upload works only when your camera is sufficiently charged and connected to a wall charger.