This feature allows to import contacts and send text messages in one single operation. You can deposit your .CSV file on a shared repository on MailUp servers: this file must contain all the required information for sending (e.g. sender, date and time of sending, body of the text message, recipients, and so on).
Please ensure you save your file using UTF-8 encoding (with BOM), otherwise extended ASCII characters (e.g. accented letters, non western alphabets...) may be corrupted.
The .CSV file must be structured in two sections: header and messages.