You can upload returned orders on the Fulfillment>Search Fulfillments page with the Import Returns button:
The upload will require you to provide a CSV file in the same format as the file downloaded from the Fulfillments page. You can accomplish this by downloading the file using the “Export CSV” button, changing the status column to “RETURNED” and/or "CANCELLED" for the appropriate fulfillments, and then uploading the modified file. Fulfillments "CANCELLED" in this way will automatically cancel their corresponding continuity purchases as well.
Alternatively, you can construct your own CSV file, using the following fields:
orderId – The order id displayed in Konnektive
status – should be “RETURNED” or "CANCELLED"
rmaNumber – The RMA number associated with the order (optional)