How can I display PDF in my React app

Is not working I'll paste the code for any suggestion

dbx.filesListFolder({path: '/folder_name})
      .then(function(response) {
        if(response){
        var a = []
        response.entries.map((r, i) => {
          console.log(r.name)
          return a.push(r.path_display)
        })
        self.setState({name: a})
        }
      })
      .catch(function(error) {
        console.log(error);
      });

I tryed using filesDownload aswell but the same