Display image from create model blade - php

Question

I have a model and when I am creating a new one I want to be able to store an image from controller, like this:
public function create($id)
{
//
$user = User::FindOrFail($id);
$photos = Photo::all();
return view('posts.create', ['user'=>$user, 'photos'=>$photos]);
}
public function store(Request $request, $id)
{
//
$validateData = $request->validate([
'title' => 'required|string',
'text' => 'nullable|max:255',
'image' => 'nullable|image|mimes:jpg,png,jpeg,gif,svg|max:2048',
'user_id' => 'nullable|int',
]);
// return 'passed validation';
$size = $request->file('image')->getSize();
$name = $request->file('image')->getClientOriginalName();
$request->file('image')->storeAs('public/images/', $name);
$photo = new Photo();
$photo->name = $name;
$photo->size = $size;
$photo->save();
$a = new Post;
$a->title = $validateData['title'];
$a->text = $validateData['text'];
$a->image = $photo;
$a->user_id = $id;
$a->save();
session()->flash('message', 'Post was created');
return redirect()->route('posts.index', ['id'=>$id]);
}
While I try to also display all available images in create blade:
<form method="POST" action="{{route('posts.store', ['id'=>$user->id])}}">
#csrf
<p>Title: <input type="text" name="title" value="{{old('title')}}"></p>
<p>Text: <input type="text" name="text" value="{{old('text')}}"></p>
#csrf
<input type="file" name="image">
<input type="submit" name="Upload">
<ul>
#foreach ($photos as $photo)
<li>
<p>
{{ $photo->name }}
</p>
<img src="{{ asset('storage/images/'. $photo->name) }}">
</li>
#endforeach
</ul>
Cancel
When I try to submit I get the following errors:
The image must be an image.
The image must be a file of type: jpg, png, jpeg, gif, svg.
This error can't be true as I try to upload only jpg and png images, but I can't understand where I do something wrong.
Edit: Is there a way to store the image without declaring a new model?