texture "animation" sync with character problem [PAID]

I need help!

I'm trying to sync a "texture" animation with a character I've used Application.CaptureScreenshot to capture this.

and here's the actual scene:

The animation consist of 13 images:

Now here's the problem:

 function playy (){
     play = true;
     print("play");
     play2();
     
 }
 function play2 (){
     while(true){
         renderer.material.mainTexture = st[cur];
         cur++;
         if(cur == 13) cur = 1;
         yield WaitForSeconds(0.05);
     }
 }

the playy function is called when I press T on my keyboard. The character also starts it's running animation. the "texture" and character is not synced! Can someone help me out? Thanks! I'll donate some $$ if I you have a working solution ;)