It says that the screen overlay is detected on the phone, why is that?

I'm using Galaxy S7.

Sometimes it says screen overlay detected on my phone, and something like a gallery app doesn't run.

Why is that?

2536 2017-04-04 Gentleman

popular Can I listen to music with Bluetooth earphones on the plane?

popular What is the nationality of Minnie?

popular How do I recycle and recycle foil like cooking foil?

popular How can I connect to watch a video on my phone on TV?

popular Why does it say that your license has expired on your phone?

Same Tag Not FE, are you not wearing it now?

Same Tag How long do I have to make an appointment if I sign up by moving my mobile number?

Same Tag How about using MacBook and iPhone?

Same Tag What happens to the existing conversation if I delete the Facebook app and reinstall it?

Same Tag Is it possible to open Kakao Talk with the same ID as the smartphone and PC?

Same Time What does it mean to be born in 0n?

Same Time It says that the screen overlay is detected on the phone, why is that?

Same Time What should I do to use the transparent case for a long time so that it doesn'