I have a group policy that looks in C:\background\defaultBackground.jpg for the lock screen. When I set the policy and did a gpupdate, restarted, logged in, and then logged back out the picture was there. However, when I changed the picture it is not updating. Does anybody have some insight as to why?

[![enter image description here](https://i.stack.imgur.com/m2XH6.png)](https://i.stack.imgur.com/m2XH6.png)