How can I attach a cloudflare bot - to deploy preview - on my Github PR?

Developers Cloudflare Pages
1

Hi! I’m new to CF and having trouble with by Github Integration.

  1. I made a CF Pages application,
  2. and integrate Github repo with the application.
    3-1. I set automatic production deployment with my main branch,
    3-2. and also set automatic preview deployment with my other branches.

So far, I can see my preview pages are deployed when I push my feature branches.

Therefore, I (and my teammates) am expecting that CF bot will appear on my Github PR,
so that it can give informations about preview deployment status and URL.

BUT the CF bot does not appear on my PR…
What can I do? Did I miss some settings?

appreciate for your help.