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    photoUpload: function () {
      var img = new Image()
      var c = document.createElement('canvas')
      var ctx = c.getContext('2d')
      let storage = firebase.storage()
      let storageRef = storage.ref()
      let filesRef = storageRef.child('images/' + this.markerId + '.jpg')
      // window.alert(img.src)
      img.onload = function () {
        c.width = this.naturalWidth     // update canvas size to match image
        c.height = this.naturalHeight
        ctx.drawImage(this, 0, 0)
        var dataURL = c.toDataURL('image/jpeg', 0.75)
        filesRef.putString(dataURL, 'data_url')
        .then((snapshot) => {
          window.alert('Uploaded a blob or file!')
          var downloadURL = snapshot.downloadURL
          window.alert(downloadURL)
        }).catch((error) => {
          window.alert(error)
        })
      }
      img.crossOrigin = ''             // if from different origin
      img.src = this.photoURL
    }