The role in practice
A camera can be connected via an external PoE switch or directly to the recorder. Those routes require a different check of address and network reachability.
An additional camera is only part of the system when it has accessible images, recording and a clear channel name.

A camera can be connected via an external PoE switch or directly to the recorder. Those routes require a different check of address and network reachability.
Determine the physical connection, current IP address, available NVR channels, and which user is managing the camera. Compare the data with a channel that already works correctly.
Add the camera with appropriate access credentials and name the channel after the actual location. Do not change network coverage of existing equipment without a review of the consequences.
Check live image, recording, detection and clock in the timeline. Label camera, port and channel in the delivery documentation.
Live connection and recording settings can be separate.
Yes. Double addresses lead to unpredictable reachability.