Firebase google file upload

 FirebaseStorage storage = FirebaseStorage.getInstance("gs://istar-user-images");
 
 StorageMetadata metadata = new StorageMetadata.Builder()
                .setContentType(mimetype)
                .build();
        StorageReference storageRef = storage.getReference();
        String file_name = UUID.randomUUID().toString();
        Log.d(TAG,"file name "+file_name);
        StorageReference imagesRef = storageRef.child("files/"+file_name);
        UploadTask uploadTask = imagesRef.putFile(Uri.fromFile(local_profile.pathFile()),metadata);
        Task<Uri> urlTask = uploadTask.continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {
            @Override
            public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {
                if (!task.isSuccessful()) {
                    throw task.getException();
                }

                // Continue with the task to get the download URL
                return imagesRef.getDownloadUrl();
            }
        }).addOnCompleteListener(new OnCompleteListener<Uri>() {
            @Override
            public void onComplete(@NonNull Task<Uri> task) {
                if (task.isSuccessful()) {
                    Uri downloadUri = task.getResult();
                    String link = "https://storage.googleapis.com/istar-user-images/files/"+file_name;
                    Log.d(TAG,"Uploaded link "+link);


                    hideProgressBar();

                } else {
                    hideProgressBar();
                    showToast("Error Uploading Image");
                    // Handle failures
                    // ...
                }
            }
        });