Another commenter asks why it's not possible to trigger with the PrtScn key and I would also think that is an essential feature.
Flameshot has key bindings just like any other screenshot program. If the shortcut is already bound by another program, then it will not let you bind it to Flameshot, I believe.
I have been using Flameshot portable for years and it isn't without missing features but I keep coming back to it. I generally use the copy function, sometimes save to location. It would be good to have a built in editor that can be loaded after the action.
ShareX can pop up an editor after a screenshot which I do use a lot.
Thank you for pointing out that ShareX has an editor. I was aware that it has that feature but I do not remember the specifics on why I went back to Flameshot.
The lacking features of Flameshot is that once you move away from the editor, you can not go back and make alterations. Not that I am aware of anyway.
Also, Greenshot is lighter and snappier than every other Windows screenshot application I've tried.
And configuring it to a the print screen button just involves assigning it, and in the case of Ubuntu, overriding system defaults.
Perhaps it's harder on Windows?