We're too old to use Smart Phones. I think that's probably a state law somewhere. But it might work well enough.
You can also set up another of your drones on a table or something similar. You can also get a Yuneec "Steadygrip" that will let someone move around and get some really great video. The Steadygrips came with some of the Q500s. You might already have one in the bottom of the box.
That is by far the easiest method. It's what I use. If I'm by myself I set up a tripod with the phone mounted in a holder made specifically for tripods.