Migrating Pixelstreaming from 4.26 to 4.27 issue

Hi everyone,
I have decided to migrate my project from 4.26 to 4.27 since the update of WebRTC doesn’t work anymore on chrome, etc…
however all of the HTML button, javascript file doesn’t work at all in after migrating to 4.27! I’ve installed the PixelStreaming demo in 2.47 but I couldn’t find how to make my 4.26 blueprints work on 4.27

Really need your help!