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Choose remote access around the job: supported Synology apps, private file shares or a deliberately published service. Compare the connection path, permissions and recovery plan before opening ports.
A working local picture does not prove remote access is ready. Trace the phone, app and camera-site connection separately, then test live view and recorded playback.
An offline remote PC is often a host-readiness problem. Separate sleep and startup from network reachability and access permissions, then test before leaving.
