frames-v2

Hi, I would really appreciate some help to get started with the frames-v2-demo. I cloned the repo and just yarn dev and serve it with ngrok as in the readme. However, the warpcast playground just displays an empty page. What's the difference between 'Preview Frame Embed URL' and 'Launch Frame'? I also tried the @frames debugger, but it says invalid frame. Is this example to work out of the box?

frens whats the best way to get help on frames building ? 
@dudecaster

Based builder of TrueCast | BasedGiving | Xonin 🔵