DoorDash unveiled its Dot delivery robot last September. Bloomberg/Getty Images DoorDash still has problems to solve before broadly using its autonomous delivery robot. Issues like loading the robots and tricky deliveries remain, CEO Tony Xu said. DoorDash is paying some delivery workers to manually load its robots, Business Insider reported. DoorDash's delivery robot isn't quite ready for prime time. The delivery service has spent the last several months testing its Dot delivery robot as it mak