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    StorageReference databaseStorage;
    int GALLERY_INTENT = 1;
    
    databaseStorage = FirebaseStorage.getInstance().getReference();
    
    Subir.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(Intent.ACTION_PICK);
                intent.setType("image/*");
                startActivityForResult(intent, GALLERY_INTENT);
            }
        });