Skydroid t12 transmitter isn't getting connected via bluetooth/usb to android phone

I’m using Skydroid t12 module and connecting it to the pixhawk cube orange. I’m just a beginner to this area and am facing an issue.
I’m not able to connect the radio controller to my android phone. When I connect through the usb cable, my android phone isn’t detecting that it’s connected to the RC. And the same problem occurs when I try connecting with bluetooth.
Kind request for some assistance.