Do not install propellers yet. To test the motors, plug in the battery and connect the USB cable to the flight controller. In the Motors tab of the Betaflight Configurator, spin up the motors one by one (move the slider to around 10%) andverify if they are spinning in the correct dire...
The DJI Air unit can only take up to 4S, if you want to power your drone with 6S, you would have to use an external voltage regulator and deal with the messy wiring. If a flight controller is designed for the DJI FPV system, it normally has a built-in BEC that provides stable powe...