Problem: I can’t get this to function. The Main Timeline (without any content/length) runs as long as the longest symbol and then loops back to the start causing all symbols to restart from their original position.
You should not loop the main timeline of the main document, but loop each symbol itself.
You can use one of the following methods to do that:
Edit each symbol to loop its main timeline.
In the main document, don’t add a symbol playback to the main timeline.
Please select Autoplay in Symbol Properties pane on the right, or add a trigger to the main timeline (of the main document) to start the symbol.
In the main document, add a timeline for each symbol to loop it, and add a trigger to the main timeline to start those timelines.