This app was mentioned in 2 comments, with an average of 1.00 upvote
If I would have known about OTG not really being supported for the Spark (and it only works with iOS and currently not with Android), I might not even had ordered the OTG adapter when I ordered my controller, portable charging station and extra batteries and prop guards.
I like to be on the latest firmware with safety related tech like small flying machines, and (with my OnePlus 5 at least) all I've been able to get to work is the image feed. With data showing up in the DJI Go 4 app, I never use that, as it's useless flying the drone without status info if you want to do it safely.
Too bad, as I would really like to be able to not only have a more stable video feed from controller to phone screen, but turn off WiFi altogether to be able to have my 4G connection back on. Push notifications from the rain radar app I use or air traffic warnings after having registered a "flight plan" in AirMap during flight would be nice.