Test Movie doesnt work when Action Script is inserted

Hi,

I'm brand new to Adobe Animate 20. I do have experience with Flash CC

I've created a basic timeline, placed an image in frame one, test movie and the image is their in the browser. The template was HTML5 Canvas

I've converted the image to a symbol, type Movie Clip, called it movPC and called the instance movPC.

Then Ive inserted the Drag Drop code snippet for the symbol.

When I then test the movie, the page is blank in the browser, the image has gone.

I've even tried a basic button with the "Click to go to Web page" Code Snippet and that shows nothing as well when testing movie.

Also, when Im in the Actions window, when I type action script Im not getting any code hints or color changes depending on whats been typed

What am I missing.

Thanks in advance

John