The action works on an area of the image you define by brushing. The result is multiple layers with advanced customization possibilities: blending modes, adjustment layers and layer masks.
The source image should be around 2000px- 4000px on the long edge. After the result is produced, with one click, the flames can be instantly regenerated and added to composition.
The action has been tested and working on Photoshop CS4,CS5,CS6,CC+