Screen overlay s6 edge

[18_6]

Hello friends.
Yesterday I updated the new software android marshmallow 6.0.1
Since then I've not been able to access my gallery ,contact , storage when I open any app such as WhatsApp, Instagram and even Facebook. Please help me out. Im able to do nothing .
It asks me to turn off screen overlayou when I do so I can't. It redirects me to the same page over and over again. It's depressing. Please help
S6 edge . 6.0.1 marshmallow

 

[Guytronic]

That's a bug in Marshsmallow.

You'll need to turn off screen overlay under settings in apps.

Turn off all the apps that allow you to do so on this screen (tap "apps with permission"):