It sends the captured screen to the clip board instead of opening the editor like you want. Solution 1 Assign a different key other than the “print screen” key for capturing screens using Greenshot. Make sure you have checked the box next to “Open Image Editor” under “Destination” in Greenshot. Solution 2.
https://superuser.com/questions/1824930/how-to-open-image-editor-automatically-in-greenshot