Can't find any useful documentation about using video clips on Video Editor. Happy to be pointed in right direction please...1) How can I use different music across a video that is made of multiple video clips. If I apply 'background music' to one clip, it overwrites all clips to same background music.2) How can I control the volume of the same background music at different points in the video?3) how to insert short sounds/audio without it becoming the continuous background?4) I'd like to use the stock audio to do this, without having to upload custom music. Is this really not possible? Ca