Adobe animate source file update in after effects

Hello,

I´ve noticed that some changes made in the animate file started to update in after effects.

I tried to change a symbol to see if it would update imidiatly like an ilustrator file, but it didn't work.
But i had problems where a symbol disapears overnight in animate and in after effects aswell.  

I'm new with animate, and by reading comments i thought that after importing tha file, an update was impossible.
Does anyone know if it is possible to update the file and it just takes a lot of time?
Also does anyone know why the symbols disappear?

The mouth appears to be in the timeline with lip sync

Thanks!