Hi, thanks for the comment and especially for the details!
I completely agree with you, I really couldn't achieve the desired result in facial animation at all. Due to the unprecedented number of bugs and the inability to extend the time (instead of a month, as planned, it turned into 3), I decided to collect all the positive and negative experiences and change my approach in the future to fix this.
This is my first time working with MetaHumans in terms of facial animation and it was like hell. Ultimately, I achieved an understanding, but completely lost patience with corrections after even DaVinci began to make bugs on the renders.
Once again, thank you for these important details, this will help me in the future improve the quality of my work.