For one server, the SFTP adapter downloads a file, issues the "rm" script command, which deletes the file. (See attached TEMP2_FTP.log)
For another server (the one we're troubleshooting), the SFTP adapter downloads a file, but never issues the "rm" script command, so the file is never deleted. (See attached TEMP_FTP.log)
I am not terribly proficient with the logs to see if something might signal the SFTP adapter that it cannot delete the file, and as such it does not issue the "rm" command.