Thanks. The NAS has no internet syncing configured, and is not exposed to the internet for remote access. I do however need to use the DNS zone on the Synology router so various clients can get to the NAS easily. I don't believe the Gen3 Starlink router will perform this service.
When the Starlink is in bypass mode, is its wifi turned off? We used the same SSID/pw on the starlink router (before set to bypass mode) when configuring the Synology router. We did this to ease client transition. If the Gen3 wifi is still on, I can change the SSID/pw so no one will join there when the Synology is providing wifi.