Add AC_QTE to your player character and set the “QTE input check” function with the “Any key” input action. It will allow the system to register and check any input action during the QTE anim notify.

Next, Open your montage and add QTE Notify.

On the detail panel of the QTE notify, you have the following:
Required key: Input action for successful QTE.
Key Icon: Input action icon.
Event to do: Action that will take place if QTE successful or not. This is an object blueprint, You can make your own code or use the included example.
Time dilation: Slow time if needed.
Screen position: Key icon position on screen.
QTE example included:
Open BP_SlamEscape object.

We have what’s called Event Outcome function, here you can assign your custom event for each status.

In this example, I made an event that interrupt the escape the boss grab/slam and plays a paired/synced escape animations. As you can see there is nothing on the fail status because we are not interrupting the boss finisher in this case.

Watch this tutorial for more examples: