**Using PSFTP I am able to connect to the server and change to the remote directory just fine so it doesn't appear to be a server side issue**
Searching for host...
Connecting to host...
Using username "username.xxx".
Authenticating with pre-entered password.
Starting the session...
Active session:  firstname.lastname@example.org
Error changing directory to '/UPLOAD_FOLDER'.
Cannot get real path for '/UPLOAD_FOLDER'.
No such file or directory.
Error code: 2
Error message from server: File not found