The Hubitat cloud api does not pass a binary HTTP like content-type ‘image/jpeg’, but it works fine via the local api.
However it does pass non-binary base64 image. So you can send an image though a HTML doc (this is a SVG example) and it will display on any browser.
I am attempting to pass an image up from the hub for display on the dashboard, and it only works locally because of these limitations.
What does work is the Refreshable URL Embed you described here which is great, but it use polling and I am attempting to drive the update via a Hubitat event for real time updates. Anyway to hook to objects for events?