To save downstream readings on the Launch CRP123 diagnostic tool, follow these steps:

Turn on your vehicle’s ignition to provide power to the OBD2 port.
Connect the Launch CRP123 to the OBD2 port, usually located under the driver’s side dashboard.
Power on the scanner and wait for it to establish a connection with the vehicle.
Navigate to the “Diagnostics” or “OBD2” menu on the scanner.
Select the option for reading live data or live data stream.
Look for the downstream oxygen sensor readings, typically labeled as “O2S B1S2” (Bank 1 Sensor 2) or “O2S B2S2” (Bank 2 Sensor 2), depending on your vehicle’s configuration.
While viewing the downstream sensor readings, press the “Save” or “Record” button on the scanner (the button may differ based on your specific model). This action will store the data in the tool’s memory.
Once the readings are saved, you can access them later by navigating to the “Review” or “Playback” menu on the scanner.
Please refer to the user manual for your specific model of the Launch CRP123, as the interface and button labels may differ slightly between models.

Is this with the OBDLink app? Is this also the case for FORScan?
Thanks
Tony