Force flash on VIDEO iphone 11

I have an iphone 11 pro max. I know that to turn the flash on for pictures, you tap the arrow at the top of the screen and turn it on. For videos, though, the arrow isn’t there. The only thing indicating flash is at the top left, and tapping it on/off does NOTHING. I can’t force the flash on for a video through the camera app if it’s light in the room that I’m in. It works on snapchat, but not apple’s camera app! There are times where I’m in a light room but want to use flash for whatever reason and I just can’t force it on! So frustrating.