Ovrlipsync doesn't work on my character

And sadly now I got 2 new problems:

1.Every time after I restart unreal engine the lipsync doesn’t work any longer when I play and if I delete the audio and the lipsync sequence, reimport and recreate them, It fixed. But what is going on earth? It shouldn’t work in this way isn’t it?
2. I still need someone with a warm heart to help me to figure out how to draw the BP to lipsync when someone speak to mic. I just copy the BP from the sample project and rewrite it base on my understand but it just doesn’t work.