The tree looks pretty easy to climb and sturdy until quite near the top, so I was originally thinking carrying it up (perhaps tied to a rope being pulled up behind them - pulling it up from the ground seems a bit much given the height of the tree).

But drones weren't a thing in my day. Maybe it was a drone, I didn't think of that. But cones are a lot heavier than they look, would a drone be able to carry a 5kg cone to that height?

I suspect if you could do it with a drone we would probably see a lot more of them.