I want to ensure the most security for my important ftp transfers. In order to connect to the server, I need a client with SFTP protocol support. Does Auto FTP Manager support secure file transfer protocol?

Yes, the latest version of Auto FTP Manager has SFTP support. While creating a new connection profile you can select the SFTP protocol from the 'FTP Protocol:' drop down. For more details on SFTP settings please refer this link: /help/auto-ftp-manager/using-auto-ftp-manager/