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For each XML file that is processed, you will also receive a file to the FTP folder with the following example format: LWSO_Load_Web_Sales_Orders.xml_06-10-17-161029_response.xml
The response file will tell you whether the upload was successful.
Examples of the success and failure response messages for each service can be found in the service details.
To find out if a FTP CSV upload was successful, you will need to login to the hub directly and view the Activity Monitor or through email notifications.