How can I add custom content to the NEW Google Sites
<p>I want to be able to add content that is served by my own server to a page on a NEW(December 2016) Google Sites site. The only way I can see of adding custom content is the 'Insert > Embed URL' option in the right hand sidebar. </p>

<p>I have requested support from the folks at Google G-Suite but they have provided little information, apart from suggesting that I use OpenGraph markup.</p>

<p>If I add a link with an image marked up with 'og' meta tags the image is displayed, which is progress, but I would like to display other content, i.e. some html that is served by my own server.</p>

<p>I see that the new Sites uses a version of Polymer under the covers - it would be ideal for me to serve a Polymer web component in the embedded link but I haven't been able to make that work.</p>

<p>Any ideas please? </p>