Can i play genshin impact on 120 fps in iphone 15 pro max

Same, I was testing the game out to see the performance on my iPhone but it just disappointed me. Through the gameplay I witness 120fps but just for 3 seconds and it just went back to 60fps, even when having the graphics set to default which is high, I also tested if it was the MetalFX that was causing this to happen but on and off the issue is still the same. The only time I get 120fps is when i’m talking to a cpu and the menu screen.