You can download the attached files in a pipe!
 

To get the links to the card attachments from a pipe via API, these are the queries you will need:
 

Attachments to cards on the pipe

{
  cards(pipe_id:XXX){
    pageInfo{
      hasNextPage
      endCursor
    }
    edges{
      node{
        id
        title
        attachments{
          url
        }
      }
    }
  }
}

Card attachments

{
  card(id:XXXX) {
    attachments {
      createdAt
      path
      url
    }
  }
}