I get a haze when I use the flash on my Note20 Ultra.

[BigD_Phil]

When I take a picture with the flash on I always get a haze or fog over the whole picture. It doesn't happen when I have the flash turned off. #foggy, #haze 

[VerbumVeritum]

Have you thoroughly cleaned your phone's lenses and flash module? Do you use a case or lens protectors? If so, try removing them.

[Belaythatorder]

Some reflective cases and lens protectors can cause this issue. Also, that large 108MP lens takes in a lot of light and I find using the camera's night mode setting better for taking low light/night pictures.