Embed websites as iframes in the new Google Sites
What’s new: We’ve heard you loud and clear—you want better ways to add content to the new Google Sites. With this launch, we’re making it easy. Going forward, you can embed an entire webpage as an iframe in a new Google site.
This will allow you to pull in content from other websites and Google tools like Apps Script, Data Studio, and App Maker, saving you the trouble of duplicating and updating that information on your page. Simply select “Embed URL” from the Insert menu. Note that this will only work if the webpage you’re trying to add allows embedding.