How do i stop my messages popping up with an ad?

[Android Central Question]

Did an update on my S9 now my messages flash up via some weird pop up that has an ad at the bottom.

 

[B. Diddy]

Welcome to Android Central! Which messaging app are you using? The ad is presumably related to adware that came with some app you installed. You may have to uninstall apps one by one until the problem goes away.