In the past it was possible to embed AppSheet in Google Sites (or any other web site) using iframes.
This feature was highly used in our company as it allowed citized developers to create rich web portals containing information from different data sources and with a nice user experience.
Since some time, AppSheet apps cannot be embedded anymore in iframes and this has caused troubles in around 40 Google Sites (embedding around 100 apps) at our company.
It would be great if this feature could work again and I believe it could also help spread the usage of Google Workspace tools.