After you enabled the cloud service (either a free trial or a paid subscription) on the Vacos camera, the camera will begin to upload videos clip for the notifications of human activity. This upload may sometimes fail if the camera’s network connection is not stable (it won’t try to re-upload if failed).
Therefore, please check if your camera has the cloud service (see below picture), and check if you can see the live video from the camera fluently.
Besides, you can also refresh the screen of notification messages to have a try. See below picture: