When you import a bitmap into Flash Professional, you can modify that bitmap and use it in your Flash Professional document in a variety of ways.
If a Flash Professional document displays an imported bitmap at a size larger than the original, the image may be distorted. To be sure that images are displayed properly, preview imported bitmaps.
When you select a bitmap on the Stage, the Property inspector displays the bitmap’s symbol name and its pixel dimensions and position on the Stage. Using the Property inspector, you can swap an instance of a bitmap—that is, replace the instance with an instance of another bitmap in the current document.
The following video tutorial describes the use of bitmaps in Flash Professional: