T1S is a bit different from
T1d.
You have to pair the
T1s in Android Bluetooth settings, where it should be recognized as a gamepad controller. Then just open TelloFpv and select the newly found controller in the controller settings.
Depending on which mode was active on the controller you may have activate Android controller mode on the
T1S first. I am currently not at home to check which button you have to press, but it's one of the ABXY buttons:
Press & hold A/B/X/Y button while pressing the power button to power on the controller.
The open Android BT settings to pair / connect it, then open TelloFpv.