This works just as expected. Only issue is the quick action shows "extimating time remaining" and just hangs there... but I can still just finish the image anyway. Also tall images go off of the screen and I cannot see which buttons I am clicking to finish or clear etc.Otherwise, the core of the app is great. Just the quick actions are extremely buggy, in my experience.
The “estimating” thing is a bug in Finder. It’s completely out of my control. If you run the Black Out quick action from Mail or Notes, it’s not there. I have reported it to Apple already*. I have not been able to reproduce the issue with the image going off the screen, but that is also definitely a Finder bug, since an extension should not even be able to do that even if it tried. All in all, the quick action system is pretty buggy as it’s relatively new and very few apps are using it. Hopefully, Apple will improve it in future macOS versions.* https://github.com/feedback-assistant/reports/issues/149