No video when trying to connect an A8 mini to SIYI QGC

Hi ! I am flying sort of a balloon with an A8 mini attached to it. I’m trying to connect it (with a long distance wifi/radio box) to SIYI QGC and control it via the touchscreenin the app. But when I connect it there’s no video even though I entered the IP adress of the camera and the right port in the settings…

Would be amazing if you could help me even a little, I really need it.

Thank you very much !