Custom UI Modal Dialog stuck in app iframe

I have a custom UI application, and I’m using the Modal Dialogue Component from the atlassian design system. However, it’s only opening within the application iframe, and hides the ModalBody contents. Does anyone know how to fix this, and make the modal appear over the whole screen?

You need to use Modal from the Forge bridge.

You’ll then find that Modal has a bug that prevents the modal contents from being 100% height: [FRGE-819] - Ecosystem Jira