weird vibration

unfortunately I can’t attach a video. but I noticed any time I record either on snapchat or just the regular camera, there is a small vibration sound coming from the back of my phone which is only audible if I play the videos back or put my ear against the back of it. It also does this whenever I interact with my screen. tapping on anything, swiping, etc. I just bought this phone and it’s supposed to be brand new. I have the iphone Xr. the sound seems to occur up near the camera area, above the apple logo. not near the speakers