how to lock focus in camera

[timmam]

Hello, I know this phone has the ability to lock focus and exposure but I cant get mine to work. When i press and hold the screen ir just goes back to the auto focus and locks it there. I want to lock at to the exposure I set it at.

[BlackShark]

It's working in J7 nxt

[timmam]

how? when I click and hold on the screen the exposure pops back to the middle

[timmam]

see