How to add back Webcore Presence Sensor

While working with the Webcore version of a presence sensor on my cellphone, I deleted the device in the smartthings app. I have been unable to find a way to get smartthings to rediscover my cellphone/presence sensor. I have tried going back through the Webcore app settings like initially setting it up, but it never gives me the option to set it as a presence sensor. I have tried uninstalling Webcore and reinstalling but that doesn’t work either. Can someone point me in a direction to get this working again?