Laravel : How to upload Multiple image file in multiple database field?

I want to upload multiple image files in database .. Here is the view part :

<input type="file" name="photo[]" >
<input type="file" name="photo[]" >
<input type="file" name="photo[]" >

And I want to store the path into different field in database..

controller code:

        $files = Input::file('photo');
        $names = [];

        foreach ($files as $file) {
            $names[] = $file->getClientOriginalName();
        }
            $imageName1 = time().'.'.$names[0];
            $imageName2 = time().'.'.$names[1];
            $imageName3 = time().'.'.$names[2];         
        $product->primary_image = $imageName1;
                $file->move('images/', $imageName1);
        $product->optional_image_one = $imageName2;
                $file->move('images/', $imageName2);
        $product->optional_image_two = $imageName3;
                $file->move('images/', $imageName3);

I got the following Error:

Creating default object from empty value in $product->primary_image = $imageName1;

Can anyone what's the error for assigning into object? or solution please ..

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