Cannot upload react-native-camera TakePictureResponse to Firebase Storage

I am trying to use react-native-camera to take a photo then upload that photo to Firebase storage. I am able to retrieve the file as a blob using RNFetchBlob, however when trying to .put() into Firebase Storage, I get a

Firebase Storage: Invalid argument in put at index 0: Expected Blob or File.

I also tried to use .putString() and pass it in as a base64 string, or just the uri however I get similar issues. Here is some related code.

export function createPhoto(photo: TakePictureResponse): Boolean {  var ref = storage.ref();  var photoRef = ref.child('photos');  if (Platform.OS === 'ios') {    var filePath = photo.uri.replace('file:', '');  } else {    filePath = photo.uri.split('raw%3A')[1].replace(/\%2F/gm, '/');  }  RNFetchBlob.fs.readFile(filePath, 'base64').then((data) => {    photoRef.put(data).then((snapshot) => {      console.log('Uploaded a photo');      console.log(snapshot.downloadURL);    });  });

Update: RNFetchBlob.fs.readFile() returns a string depending on the decoder option you pick (for this example it is base64). However I still have issues as Firebase Storage will not accept my base64 string with .putString(data, 'base64'). I get a "Firebase Storage: String does not match format 'base64': Invalid character found" error.