FTP over SSL is available to clients who want to sync data securely to File Transfer Protocol Servers using a secure SSL connection.

SFTP and FTPS are completely different protocols, despite the similar names. The IT industry unfortunately has adopted protocol names in an extremely confusing way.
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Adding to the confusion, both protocols take similar inputs (ports, password, etc.)
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SFTP uses an SSH connection whereas FTP over SSL uses an FTP connection.
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Ask your IT admin exactly which is protocol you need, then select the right Data Destination in your job's settings.

If you need to allow-list Flatly's address you can find it here:
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More information about FTP over SSL:
​https://en.wikipedia.org/wiki/FTPS