Lip sync help needed!

Hello! Needing a bit of assistance on the auto lip-sync feature in Adobe Animate. 

I love the idea of this feature! However, It's not working as it should for me. I've attatched a video i took of the problem. I started a new file from scratch, and everything you see is sped up by around 1.5x speed. As you can see, I converted the mouths to graphic symbols, but I can only use the one for the frame picker that I have currently selected the frame for. Once I switch to the other frame that has the other symbol on it, I can only see that symbol in place of the old one. (Basically, I cannot see the different symbols I have created all at one time without switching frames.)  [I hope that makes sense!] Love this program, and thank you for the help!

See the attatched movie for a visual representation.