Use imported JPEG data vs: Use document default quality

I have created two fla files and imported jpegs into each. when I go into the library and view the properties of the images in each fla file they give me different options for export. One of the fla files gives me a “Use imported JPEG data” checkbox and the other one gives me a “Use document default quality” checkbox. I like the use imported JPEG data option better. Why are they different??? (driving me nuts :slight_smile: