I need to change the wording on the website to make things more clear.
At the moment, you can use the online telemetry upload to view your flights in the website. If you have a Typhoon H registration, then you can list all your flights online and download pilots logs.
However, the app is not compatible with the ST-16S. I have no immediate plans to change this as I don't personally have a H520 to carry out the necessary development.
If people on here would like to see UAV Toolbox on the H520, you can help by letting me know, and by letting Yuneec know that you value third party apps such as UAV Toolbox.