Do not know how to grab Dropcam image

Harper,

We aren’t able to access the suggested REST API below for camera image using the OAuth Token that is negotiated for access to our SmartApp. Specifically, the OAuth Token that was successfully obtained with the “https://graph.api.smartthings.com/api/smartapps/endpoints” API.

Suggested REST API for camera image:
https://graph.api.smartthings.com/api/s3/smartthings-smartsense-camera/afb8d849-dc2b-41c8-a736-d9b487b1ed15.6f3e262cfdaa4a1591143c7c630ae1c6_425259bc8f1e4f5b86f619c63040da5d.jpg

Returns the following response using SmartApp auth token:
{
error: true
type: "AccessDenied"
message: “This request is not authorized by the specified access token”
}

How do we get by this?