Responder users can attach documents to their questionnaire submissions as well as all entity types. To see these documents, click on the appropriate link to get to the relevant entity.
On the Entity profile page, click on the Documents tab.
You can click on the "Eye" icon next to the document name to download and view the file. You can also click on the name of the document to open the Document page. This will allow you to add notes and access additional functions.