One of the bugs I noticed is the fact that when you take a screenshot that requires you to scroll (ex. an article), if the website had a sticky scrolling navbar, it will appear in the middle of your screenshot every single time.
A) Freeze the page in a pre-screenshot snapshot and then allow the user to “screenshot” from that. Effectively, the user would be just cropping the previously taken screenshot in reality.
B) Alternatively, you could allow the (save/copy/discard) buttons to float to the top or to the side instead of staying always on the bottom of the cropped frame. This allows users to scroll back up pulling the buttons along with them and avoiding the sticky navbar altogether.