File saving failed using batch

[miup]

[REQUIRED] Step 1: Describe your environment

• Xcode version: 9.2
• Pring version: 0.7.8

[REQUIRED] Step 3: Describe the problem

I tried to save Images using WriteBatch class.
Saving to Firestore is succeeded, but File is not saved in storage.

Relevant Code:

class Image: Object {
    dynamic var file: File?
}

let imageModel = Firebase.Image()
imageModel.file = File(data: UIImageJPEGRepresentation(image, 1.0)!)
let batch = Firestore.firestore().batch()
batch.add(.save, object: imageModel)
batch.commit { error in
    print(error) // printed nil, but file is not exist in storage
}

[kogetaro]

I have also encountered the same problem.
・Xcode version: 10.0
・Swift version: 4.2
・Pring version: 0.13.6

[brightsider]

Has same issue