Would someone be kind enough to explain a little more about how the Surveillance Centre and notifications work? For clarity, I'm not asking how to configure them, more how they function. For example, when an IP cam or an NVR is configured under smart events to "notify surveillance centre" where is this surveillance centre running... on a networked NVR... on Hikvision servers, and is this the same location that delivers the push notifications received by the Hik-Connect iOS app? Thank you.