Batch import is the automation of the operations that can also be executed through the file import functions available at the page Recipients > Import in the MailUp console.
...
(S)FTP-based data synchronizations are not available out-of-the-box (additional costs may apply), contact your sales representative for an estimation.
(S)FTP Data synchronization are not available to MailUp trial accounts.
Using Data Sync FTP import you can decide (by simply uploading a new .csv file) when running the file exchange to import data coming from an external system or application to MailUp.