Doorbell camera needs more than one chime

I have two doors to my home, front and back, which are both accessible to the public. I purchased two doorbell cameras but I find that there is only one chime so I can't tell the difference. My only option is to get my cell phone, log into the app, select each of the two cameras before I determine which door to answer. I suggest that there be more than one default chime. It would be helpful if a collection could be downloaded like ringtones.