How to upload and save image file?

Why this code does not work?

public function store(CategoryRequest $request)
{
    $image = null;
    if ($request->hasFile('image')) {
        $randomize = rand(111111, 999999);
        $extension = $request->file('image')->getClientOriginalExtension();
        $filename = $randomize . '.' . $extension;
        $image = $request->file('image')->move('images/categories/', $filename);
    }
    Category::create([
        'name' => $request->name,
        'latin' => $request->latin,
        'parent_id' => $request->parent_id,
        'image' => $image,
    ]);
    return redirect()->route('categories.index');
}

I added enctype="multipart/form-data" in my form tag now.

My code is does not uploads and only save in database.