Insert : select to split the clip and insert the particle effect between the two portions.Overwrite : select to overwrite the existing clip with the particle effect.When adding a particle effect to the timeline (inserting or dragging and dropping), if the timeline slider is over an existing clip, or you drop it on an existing clip, you are prompted to use one of the ripple editing options to insert the clip: A duplicate particle effect template will be placed at the new position.
If you'd like to duplicate a particle effect template on the timeline, hold down the D key on your keyboard and then click and drag your mouse to a new position in the timeline. Note : hold down the Alt key on your keyboard when moving or resizing particle effects on the timeline to temporarily turn off the snap to feature for smoother clip movement and placement.
