How to autostart HTML page with customwebview?

Hi,
I want to embed my HTML file in webview, with image + text + audio inside. link below :
https://storylines123.s3.ap-southeast-1.amazonaws.com/cobequangkhando9/story.html

I looked at many topics related to customwebview extension but still not applicable to my case.
Here are the blocks I used, and I get a flickering screen without autostarting.

Please help me to solve this case. Thank you very much.

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