transactions/<transaction-id>/filestransactions/<transaction-id>/documents/<document-id>/sourceFilestransactions/<transaction-id>/documentstransactions/launch
To order the files in the document or documents in the transaction, specify the index for each of them during file upload or document creation
transactions/<transaction-id>/filestransactions/<transaction-id>/documents/<document-id>/sourceFilestransactions/<transaction-id>/documentstransactions/launch