More engines, less efficiency. Four motors are too much for such small UAV.
Seems like there's not much anchor points for tying down cargo, is this intended?
A short video that answers some questions posed previously. The reason this drone has a four-engine layout is due to it being a dual-use drone. In the civilian role as a cargo transport, four engines provide extra safety margins. When used as a military platform, four engines provide greater electricity generation capacity (24kW total) that can accommodate power hungry sensors, EW equipment, and other payloads. Also, the engines are off-the-shelf civilian models that use 95-octane gasoline, thereby greatly simplifying logistic requirements and running costs. In the future, rails will be installed on the cargo bay floor for easier cargo handling and for air drops.