Flameshot with sway has been a nightmare for me. I have tried a couple of times but i have never gotten it to work. I have settled with grimshot. The biggest missed feature is the number annotator. It was so easy with flameshot to annotate a screenshot with 1-9 and then refer to each number in a document. I really miss flameshot:(

The solution I posted includes an incrementing number annotator btw. Satty has a lot of great features. You can even capture the whole screen so that you can crop it after you've done your annotation which is similar to how Flameshot works.