That is a new feature and enhancement to the Motion Alert – You can read more about it in our documentation via the link below, but in a nutshell it provides you with a link to the image that was captured when the motion event was triggered. If you are encountering a situation where the image was not accessible, please open a case and report that issue, so we can investigate. We'll also get this attribute defined and added to our webhook API documentation so it's clear.
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