uploadImage = (uri) => {
    const imagesRef = firebase.storage().ref().child('images').child(uuid.v4());

    const downloadURLPromise = new Promise((resolve, reject) => {

      const xhr = new XMLHttpRequest();
      xhr.onload = function() {
        const blob = xhr.response;
        console.log(blob);
        var uploadTask = imagesRef.put(blob);

        uploadTask.then((snapshot) => {
          snapshot.ref.getDownloadURL().then(function(downloadURL) {
            console.log('File available at', downloadURL);
            resolve(downloadURL);

          }).catch( (error) => {
            reject(error);
          });
        }).catch( (error) => {
          reject(error);
        });
      };
      xhr.onerror = function(error) {
        reject(error);
      };

      xhr.responseType = 'blob';
      xhr.open('GET', uri, true);
      xhr.send(null);

    });

   return downloadURLPromise;
  };