Solved: I figured out how to switch controls to R1/L1 to shoot/aim - Answer HQ
Buy Grand Theft Auto V - Premium Edition (PS4)+Razer Kishi V2 Mobile Gaming Controller for Android: Console Quality Gaming Controls - RZ06-04180100-R3M1 Online at Low Prices in India | ROCKSTAR GAMES Video
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GTA 5 guide: how to configure first-person views on PS4 and Xbox One | VG247
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Proof of concept: GTA V PS4/PS5 Controls Overhaul – gyro aim, no camera auto-center, inertial scrolling (Titan Two) : r/GyroGaming