If you want to record your custom automatic call recording greeting via computer, first, you must log in to your RingCentral account.
Click on the Settings tab, then choose Phone from the list. Under the General section, Click on the Edit button of the Extension Settings. You'll be redirected to a new browser window to edit your settings.
Choose Settings, then Choose the Screening, Greeting & Hold Music tab. Once your call recording is enabled, you can click Edit and choose from the drop-down menu from Default to Custom.
From the Computer Microphone, click the record button. If you want to stop, press the Record button again. To listen to the recording, press the Play button. Then, click on the Upload button to save the custom greeting. Then, click done. You'll be redirected to the Call Recording Settings page. Finally, click Save.