As I mentioned on the Input Buffer System page, in order to use the input buffering system you need to add an Animation Notify State, ANS_InputBuffer, in your Animation Montages. This will allow you to precisely control the frames of a buffer. During the notify state frames, the inputs will be Queued or stored in a buffer.

Basic Usage

Open the Anim Montage that is played by your ability, and add a ANS_InputBuffer Notify State in one of the Notifies Tracks.

Make it start / end when you want to open and close the input buffer, by dragging the little slider on the notify state at the exact desired frames.

Note: If you ever have the issue of the notify state being called twice, E.g. Buffered Input Actions cancel into each other when spamming inputs, make sure to change the Montage Tick Type to Branching Point.