All questions related to installations, configurations and maintenance of Advanced Host Monitor (including additional tools such as RMA for Windows, RMA Manager, Web Servie, RCC).
There is no FTP test method in HostMonitor.
However, if you can install RMA agent (e.g. UNIX RMA) on your FTP server, you may use "Folder/File Availability" test method with the following settings:
Alert when: file doesn't exist or older than 10 min.