Hello @Juan Torres!

First of all you should be sure that your responses are from a distribution related to that transaction. If so, transaction data behaves similar to embedded data. That means that you just have to include them in the survey flow as embedded data for them to be part of the Data & Analysis tab, and therefore, part of the export responses file. 

Something similar is explained here: 

Importat to note that if your distribution is not realated to the transaction, it won’t identify that transaction data.

Hope this helps :) 

Is there a way to link the distribution to the transaction every time the customer takes a survey automatically?