I have been using Flash to animate for years. I have upgraded from Flash 8 to Flash CC. I had been animating and then exporting the video part, (swf.), and sound (wav) separately, and then bringing them into After Effects already as synced files.
That option is no longer available in Flash CC. What can I do? (I am really considering Toon Boom after this project).
If CS6 has that capability then you can go back to using it. If you have a full Cloud subscription CS6 is available for download as part of that.
Haven't tried this, but you should be able to export a video file containing only the sound track from within Flash. Just turn off all the other layers. Also, although you are probably aware of this, Adobe claims that Flash CC now exports video without the bugs that plagued earlier versions. Then you should move to Toon Boom, it has its own headaches, but at least it's a real animation program.