A unmanned aerial vehicle (UAV) includes a fuselage body including a cavity that forms a cargo bay for transporting a payload, an upper access opening for receiving the payload into the cargo bay from a first direction, and a lower access opening for lowering the payload from the cargo bay. The UAV also includes an upper door associated with the upper access opening that is movable between a closed position in which the upper access opening is obstructed and an open position providing a path for the payload into the cargo bay. The upper door includes a winch configured to unwind or retract a tether secured to the payload.