You can read about using the HTML Component and onMessage and postMessage on these pages.
https://support.wix.com/en/article/corvid-working-with-the-html-element
https://www.wix.com/corvid/reference/$w.HtmlComponent.html
Search the forum for previous posts on this…
https://www.wix.com/corvid/forum/community-discussion/solved-send-message-from-page-code-to-html-image-database
https://www.wix.com/corvid/forum/community-discussion/updating-dataset-from-iframe-result-after-image-capture
https://www.wix.com/corvid/forum/community-discussion/html-iframe-with-different-videos