In previous one UI, we used to have OTP copy button when a message was received. Please add it back. I was able to input the OTP without even opening messages app.
If you are using Samsung keyboard, it should auto populate OTP that is detected in messages in to field directly with out even needing to copy paste. Please note this may not work in all apps.
Please make it work for more apps because it really feels limited right now. Also please add the feature to auto copy otp from Samsung email too like ios does in their mail app. It's super convenient and seamless.
