The role in practice
A camera that is offline or refuses to connect in the app may trigger a reset prompt. Without inventory, the address, settings, and connection to the recorder may be lost.
Resetting is an intervention step that can be meaningful, but does not solve a cable, power or account issue.

A camera that is offline or refuses to connect in the app may trigger a reset prompt. Without inventory, the address, settings, and connection to the recorder may be lost.
Compare behavior with a working camera and check power, connection, address and NVR status. Make clear who can then re-activate and configure the camera.
Use a reset pass when it is specifically recommended for the found cause and recovery data are available. Limit the reset to the necessary device.
Reinstall the camera carefully, test recording, and check whether old channels, notifications, and user permissions are back in logical order. Note the reason and result of the change.
A camera reset does not automatically change NVR recordings, but check the entire chain.
No. Research on power supply and cable separately.