Changing lock screen wallpaper? Bug?

[b3ava]

So changing walpapers has never been so frustrating for me before.. I tried the traditional method of gallery find picture I want and set as wallpaper.. That doesn't work..
I figured out that to set home wallpaper you need to go through settings etc to do it..
but where on earth is there an option to set a lock screen wallpaper??

 

[ermacwins]

If you're using a different launcher such as Nova then go back to miui launcher and get again