To zoom, put two fingers on the screen and spread them out.It goes up to 2.0 zoom. Also, if you press your finger on the screen you get a blue circle, with that you can tile the camera up and down with your finger.
If you have any interference then turning off Blueooth and WiFi may help, I leave mine on.
I have using phantom 4. and i want to use my drone for the time lapse photos! for each weak i need to take 1 photo from same height, same coordinat and same gimbal angle. Can i do that with phantom 4? if i can, so.. how ? =))) any helps?