You'll likely have issues fitting the USB cable.
The Mi Max's hardware should be fine running the Go 4 app. I've used my Redmi Note 3 Pro which has the same CPU and other specs, and it works well. If the DJI USB cables don't fit you could use the controllers bottom USB port with a 20cm cable as you would for a tablet.
It won't. 6" Just about fits with the cable at the very end of the "cutout" in the handle.
Any bigger and you'll have to put the phone awkwardly further down, then the included cable is too short, and any other you'd use ends up going into your hand exactly where you'd want to rest your palm to hold everything comfortably.
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