Using this feature, you can send the campaign to customers/audience that is outside of the CareCloud database.
Open application "Campaigns & Segmentation."
Click on "Emailing" and select "Audiences" and "Customer ID file upload."
You can then name your audience and add a description.
Click on "Select a file" and upload a file in CSV format with your contacts.
Click on "Create an Audience" to finish it.