Gamecamera not moving when testing with device

So Im bulding a racing game and have about 50% finished. Just wanted to test it on my android device via uploading apk and suddenly realized that the main game camera is not moving with my cube which I attached the standard smoothfollow c# script. The strange thing about this is that everything works clear and nice on editor. I also connected my device and then pressed play button on editor, worked perfectly. However, only if I upload apk the main camera which should follow a "cube" isnt moving, while the cube is.

Any ideas why this could happen?

(Script is standard smoothfollow script. I dragged a cube to it as target)

P.S Im trying to figure it out for about 4 hours now...