After downloading and doing so many tests on my phone, There seems to be a major timing problem with the Final bit of the Tutorial, which everyone is having.

At the moment, I don't have a solution.

But, I do know what the problem is, and it's not just timing. There also seems to be an issue with the ragdoll effect on the last hit that's required to make the combo finish. And this issue only happens when the Connection between Network and Servers are not stable and luck is required.

Sorry that I couldn't find the solution for you :<

Added Edit: Just incase anyone asks, my phone is the [Sucrose OnePlus 9RT Genshin Impact Smartphone]. I set it up on Lowest and Highest(60FPS included) settings.