UploadTask uploadTask = storageReference.putFile(imgUrl);

tasks.add(uploadTask);

for (UploadTask str : tasks) {

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();
                            }
                            return storageReference.getDownloadUrl();
                        }
                    }).addOnCompleteListener(new OnCompleteListener<Uri>() {
                        @Override
                        public void onComplete(@NonNull Task<Uri> task) {
                            if (task.isSuccessful()) {
                                Uri downloadUri = task.getResult();
                                addPhoto(downloadUri.toString());

                            } else {
                                Log.d(TAG, "onFailure: Photo upload failed.");
                                Toast.makeText(mContext, "Photo upload failed ", Toast.LENGTH_SHORT).show();
                            }
                        }
                    });

}