edit function is not working

3 Dots on top > Open in photos editor pro. I don't use it though. try Snapseed or picsart they are best. u can find many tutorials how to use them.✌

That's photo editor permission issue..

go to settings>select apps>click 3 dots at top right corner>select show system apps>scroll down to photo editor>select it>click on permissions>grant permissions

now try again