The Tx lever/Ch7 pot does 'not' work with the app running.
It will only tilt the camera when the app is not runng ... making it all a moot point, because you have no FPV without the app running.
I tried the old DJI Tilt tool (that some people call "the tilt hack") and no improvement.
In fact ...... when using the tool you get an "error 27" show up in a little window on the PC, and after clicking H3-2D, it all reverts back to unchecked boxes the next time you run it.
Maybe if you revert to something below 2.0 firmware ..... ????