Getting a photo from the device to the Camera Roll folder?

Hello,

I have an app that can take a photo and then it makes a preview of it and then saves the photo to the device using the PhotoCapture class. I can find the photo through the device portal in the file explorer but, how do I get it from there to the camera roll folder that is on the device?

For those curious I have it saved under: UserFiles -> LocalAppData -> AppName -> LocalState

The current file path:

string filePath = Path.Combine(Application.persistentDataPath, filename);

Any suggestions would be appreciated.