How do I host pdfs that I want to use with Adobe PDF Embed API?

I added the demo script below to my site with my client ID and it pulls in the pdf sample file as expected (URL in red).  I then added my own pfd URL and it fails to work.  I get a "File preview not available, please reload to try again" error. Here's the pdf I was trying to display:  https://medpower.com/s/himycasstatesubmissionfilecreation.pdf

Do I have to save the source PDF files in a special way or on a special website before I can pull them in using the PDF Embed API? I don't understand why the demo URL works, but mine does not.  Any help you can provide is greatly apprecaited!

FYI, here's the code I used that substitutes our pdf URL:

<div id="adobe-dc-view" style="width: 800px;"></div>
<p>
<script src="https://documentservices.adobe.com/view-sdk/viewer.js"></script>
<script type="text/javascript">
document.addEventListener("adobe_dc_view_sdk.ready", function(){
var adobeDCView = new AdobeDC.View({clientId: "XXXXXXXXXXXXXX", divId: "adobe-dc-view"});
adobeDCView.previewFile({
content:{location: {url: "https://medpower.com/s/himycasstatesubmissionfilecreation.pdf"}},
metaData:{fileName: "himycasstatesubmissionfilecreation.pdf"}
}, {embedMode: "IN_LINE"});
});
</script>
</p>