AMP (Accelerated Mobile Pages) is a WordPress Plugin released to help improve mobile browsing experience. It is designed to render the page faster by only loading the text and media without scripts and many styles.
Since AMP renders the WP editor content in a minimal fashion, it is not 100% compatible with Elementor created content.
Important! In case you experience the 「Preview could not be loaded」 error, it might be related to AMP. For more information click here.