It is kind of confusing but the SmartThings Dlink devicetype doesn’t have the “Image Capture” capability as far as I know it only has “Video Camera” and “Video Capture” which are for live video in the app and video clip recording. To use the photoburst you would need a devicetype with “Image Capture”. You can try the Generic Camera Device with it and see if it works how you want.
I think that they will be adding more capabilities to the supported cameras in a while but who knows at this point.