How do you use a Let's Encrypt certificate with the Alexa service?
<p>I created a Let's Encrypt certificate using SSLforFREE. It works great in the browser, but generates an "unknown certificate" error when used with an Alexa skill. Manually uploading the certificate to the Alexa service works, but it will not work as a "trusted" certificate. </p>

<p>Has anyone successfully used one of these as a "trusted" certificate with Alexa?</p>