File Preview Error: Demo works but new PDF does not

Hey all, 

Cool tool.  But can't get it to run with my own PDF.  Works fine with demo PDF from tool.. so know I have the ClientID and credentials setup.

Works: http://c19rh.org/assets/1/yes.html

Error: http://c19rh.org/assets/1/no.html

Source File reference in no.html: https://c19rh.org/smx.pdf

What am I missing?  Thanks!

<!-- Works fine with demo PDF from adobe.com -->

<div id="adobe-dc-view" style="height: 760px; width: 800px;"></div>
<script src="https://documentcloud.adobe.com/view-sdk/main.js"></script>
<script type="text/javascript">
	document.addEventListener("adobe_dc_view_sdk.ready", function(){ 
		var adobeDCView = new AdobeDC.View({clientId: "d6b9af64d40d44bcafe797e71085ecc6", divId: "adobe-dc-view"});
		adobeDCView.previewFile({
			content:{location: {url: "https://documentcloud.adobe.com/view-sdk-demo/PDFs/Summary.pdf"}},
			metaData:{fileName: "Summary.pdf"}
		}, {embedMode: "SIZED_CONTAINER"});
	});
</script>

<!--  Swapped out location URL and file name - get "file preview error". 

<div id="adobe-dc-view" style="height: 760px; width: 800px;"></div>
<script src="https://documentcloud.adobe.com/view-sdk/main.js"></script>
<script type="text/javascript">
	document.addEventListener("adobe_dc_view_sdk.ready", function(){ 
		var adobeDCView = new AdobeDC.View({clientId: "d6b9af64d40d44bcafe797e71085ecc6", divId: "adobe-dc-view"});
		adobeDCView.previewFile({
			content:{location: {url: "https://c19rh.org/smx.pdf"}},
			metaData:{fileName: "smx.pdf"}
		}, {embedMode: "SIZED_CONTAINER"});
	});
</script>
-->