Laravel "Call to a member function storeAs() on null" while using the enctype="multipart/form-data" tag on my blade form

Question

I'm creating a basic upload form with different input fields, but once I submit my form I'm getting the error :

Call to a member function storeAs() on null

I checked the problem it could have been and everyone was talking about adding the enctype="multipart/form-data" tag on the form... which is already present, so now I really have no clue about what my error could be...

drive.blade.php :

<x-app-layout>
    <x-slot name="header">
        <h2 class="font-semibold text-xl text-gray-800 leading-tight">
            {{ __('Drive') }}
        </h2>
    </x-slot>

    <div class="py-12">
        <div class="max-w-7xl mx-auto sm:px-6 lg:px-8">
            <div class="bg-white overflow-hidden shadow-xl sm:rounded-lg">
                <form action="/postForm" enctype="multipart/form-data">
                    <label for="file">File:</label><br>
                    <input type="file" id="file" name="file"><br>
                    <label for="folder_id">Folder ID :</label><br>
                    <input type="text" id="folder_id" name="folder_id"><br>
                    <label for="organisation_id">Organisation ID :</label><br>
                    <input type="text" id="organisation_id" name="organisation_id"><br>
                    <label for="organisation_type">Organisation type :</label><br>
                    <input type="text" id="organisation_type" name="organisation_type"><br>
                    <input type="submit" value="Submit"><br>
                </form>
            </div>
        </div>
    </div>
</x-app-layout>

My route : Route::get('postForm', "App\Http\Controllers\FileController@store");

My controller:

public function store(Request $request)
    {
        $userLogged = Auth::user();

        $document = $request->file("file");
//        dd($document);


        $organisation_type = $request->organisation_type;
        $organisation_id   = $request->organisation_id;
        $folder_id         = $request->folder_id;


        $path = $document->storeAs('public', "tempName");

        return response()->json(["result" => "ok"], 201);
    }

Answer 1

The Error Is Showing To me 419 Page Expired Because You Don't Add

@csrf In Your Blade

Or You Can Add <input value='csrf_token()' hidden>