我无法从 Firebase 存储（Angular/Ionic）获取图像 downloadUrl

我正在尝试从 firebase 获取图像的 downloadUrl，所有属性（如“timeCreated”、“fullPath”、“contentType”）都运行良好并正确推送！但我不知道为什么“downloadUrl”不起作用！

captureAndUpload() {
    this.dataProvider.captureImage().then(data => {
     this.dataProvider.uploadImage(data).then(res => {
        this.dataProvider.storeImageInformation(res.downloadURL);
      });

    });
  }

数据提供者：

storeImageInformation(downloadURL)
 {
this.db.list(`/profiles/${this.afAuth.auth.currentUser.uid}`).
push(downloadURL); 
      }

有什么想法吗？！

谢谢，道格，你是对的。

正确的代码是这样的：

captureAndUpload() {
this.data.captureImage().then(data => {
  let upload = this.data.uploadImage(data);

  upload.then().then(res => {
    this.data.storeImageInformation(res);
  }); 
}

数据提供者：

uploadImage(image) {

let storageRef: AngularFireStorageReference;

let newName = `${new Date().getTime()}-${this.afAuth.auth.currentUser.uid}.png`;

storageRef = this.afStorage.ref(`/images/${this.afAuth.auth.currentUser.uid}/${newName}`);

return storageRef.putString(image, 'base64', { contentType: 'image/png'})
          .snapshotChanges().toPromise().then(_ =>
             {
              return storageRef.getDownloadURL().toPromise().then(res => {
                console.log('URL: ', res);
                return res;
              });
            }
          ) 
        }

 storeImageInformation(downloadURL) {
  return this.db.object(`/images/${this.afAuth.auth.currentUser.uid}`).update({img: downloadURL}); }