Adobe Animate: Export Movies
If all you want is to export H264s from Animate, I go over all of that in the first 8 minutes. Animate is not setup intuitively, so this video shows how to avoid certain issues.
The second part of the video goes over exporting PNG sequences, which is one possible way to get your projects into programs like After Effects for compositing.
0:00- Export an H264 out of Animate
8:20- Export a PNG sequence with a clear background
13:00- Import your files into After Effects
(I have better tutorials on this YouTube channel if you want to take a deeper dive into After Effects)