What is the main timeline?
The “main timeline” represents the internal timeline of the SWF file you are creating and it is not the same thing as the physical timeline that appears at the top of the Main window. Files played using the main timeline play mode or played with LoadMovie will stream when posted on the Web (this is not an issue for files played locally) as opposed to files played independently in a sprite, which do not stream (they preload and must download completely before they start to play). The important thing to keep in mind is that any actions in a file played on the main timeline will affect the entire project you are creating. For instance, if there is a stop action at the end of a file you import to play on the main timeline, it will stop the entire project when the Flash player reaches that stop action. For this reason, the default play mode for imported files in Linx is to play in a sprite, but you can easily change the default play mode in the Options window. Keep in mind that all the file