When i upload multiple images to my database, only the last one is saved.

Here is my controller for creating a post.

 public function store(Request $request)
    {
       $data = request()->validate([
            'postTitle' => 'required',
            'postDescription' => 'required',
            'postTradeValue' => 'required|integer',
            'postTradeOption' => 'required',
            'postCategory' => 'required',
            'postTradeInterest' => 'required',
            'postTags' => 'required',
            'postImage.*' => 'required|image|mimes:jpeg,png,jpg,gif,svg',
            'thumbnail.*' => '',
        ]);

        foreach($request->file('postImage') as $postImage) {
            $basename = Str::random();
            $original = $basename . '.' . $postImage->getClientOriginalExtension();
            $thumbnail = $basename . '_thumb.' . $postImage->getClientOriginalExtension();

            Image::make($postImage)
                ->fit(250,250)
                ->save(public_path('storage/photos/' . $thumbnail));

            $postImage->move(public_path("storage/photos/"), $original);
        }

        auth()->user()->posts()->create([
            'postTitle' => ucfirst($data['postTitle']),
            'postDescription' => $data['postDescription'],
            'postTradeValue' => $data['postTradeValue'],
            'postTradeOption' => $data['postTradeOption'],
            'postCategory' => $data['postCategory'],
            'postTradeInterest' => $data['postTradeInterest'],
            'postTags' => strtolower($data['postTags']),
            'postImage' => $original,
            'thumbnail' => $thumbnail,
      ]);

        return redirect('/profile/'. auth()->user()->id);
    }

    public function show(\App\Post $post)
    {
        return view('post.show', compact('post'));
    }

here is the migration

Schema::create('posts', function (Blueprint $table) {
            $table->id();
            $table->unsignedBigInteger('user_id');
            $table->string('postTitle');
            $table->longText('postDescription');
            $table->string('postCategory');
            $table->string('postTradeValue');
            $table->string('postTradeOption');
            $table->string('postTradeInterest');
            $table->string('postTags');
            $table->string('postImage');
            $table->string('thumbnail')->nullable();
            $table->timestamps();

            $table->index('user_id');