in the publish settings you can add a preloader the will display until all the assets needed are loaded.
Thanks so much. Do you know anything about what Sprite template or SpriteSheet is for?
a sprite sheet is a bitmap that contains smaller images (typically of one or more animations) and is a standardized way to export animations from one program (eg, animate) and import to another program (eg, unity), and a way to enhance performance.
create one (from a movieclip that has changing bitmap) and inspect it in any graphic viewer.
Okay, thanks for the information about sprite sheet.