Stonebranch has many file monitoring utilities and based on the interface exposed to you to interact with the computer with your file you will want to use different utilities in stonebranch. 

Methods that will work on centrally supported services and general FTP servers (Jscape, Transfer.its):

This utility uses the FTP (or SFTP)  protocol to poll the file sever looking for the file, so it can be used with any sever that exposes an FTP endpoint.

Of note it will just query once if you don't check the 'Wait until Satisfied box'. 

Methods that only work if you have a Stonebranch agent on the sever with the file you wish to monitor:

These below utilities are specific to agents and are using the agent process to watch the file. (Note that there is a common-use agent on transfer.its, in case you'd like to use file monitors there)