Blocage sur la formation Laravel 5 effectuée en Laravel 6

Bonjour,

Voila je rencontre un petit problème avec mon code. Je suis la formation Laravel 5 et je veux réussir à la faire en Laravel 6.
Je rencontre pas mal de soucis dans la gestion des mages.

Ce que je fais

Mon controller:

<?php

namespace App\Http\Controllers;

use App\Post;
use Illuminate\Contracts\Auth\Guard;
use App\Http\Requests\UpdatePostRequest;

class PostsController extends Controller
{

    public function __construct(Guard $auth){
        $this->middleware('auth');
    }

    public function create(){
        $post = new Post;
        return view('posts.create', compact('post'));
    }

    public function store(UpdatePostRequest $request, Guard $auth){
        $data = $request->only('name', 'image', 'pets_id', 'content');
        $data['user_id'] = $auth->user()->id;
        $post = Post::create($data);
        return $post;
    }
}

Mon Validator:

<?php

namespace App\Validator;

use App\Pet;
use Illuminate\Support\Facades\Auth;
use Intervention\Image\ImageManagerStatic;

class Validator extends \Illuminate\Validation\Validator {

    public function validatePetsowner($attribute, $value, $parameters){
        if (empty($value)) {
            return false;
        }

        $pets_count = Pet::whereIn('id', $value)->where('user_id', Auth::user()->id)->count();
        //dd($pets_count);
        return count($value) == $pets_count;
        //return true;
    }

    public function validateDimension($attribute, $value, $parameters){
           //dd($value);
        $image = ImageManagerStatic::make($value);
        return $image->width() >= $parameters[0] && $image->height() >= $parameters[1];
    }

    protected function replaceDimension($message, $attribute, $value, $parameters){
        $message = str_replace(':width', $parameters[0], $message);
        $message = str_replace(':height', $parameters[1], $message);
        return $message;
    }
}

Mon Post:

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Intervention\Image\ImageManagerStatic;

class Post extends Model
{
    public $fillable = ['name', 'image', 'pets_id', 'content'];

    public function getImageDir(){
        return'img/photos/' . ceil($this->id / 1000);
    }

    public function setImageAttribute($image){
        if (is_object($image) && $image->isValid()){
            self::saved(function($instance) use ($image){
                $image->move($instance->getImageDir(), $instance->id . '.' . $image->getClientOriginalExtentsion());
                ImageManagerStatic::make($image)->fit(360,200)->save($instance->getImageDir() . '/' . $instance->id . '_thumb.jpg');
                ImageManagerStatic::make($image)->fit(940,530)->save($instance->getImageDir() . '/' . $instance->id . '_large.jpg');
            });
            $this->attributes['image'] = $image->getClientOriginalExtentsion();
        }
    }
}

Mon UpdatePostRequest:

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class UpdatePostRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        $rules = [
            'name' => 'required|min:3',
            'image' => 'image|dimension:940,530',
            'pets_id' => 'required|petsowner'
        ];
        if ($this->method() == 'POST') {
            $rules['image'] .= '|required';
        }

        return $rules;
    }
}

Mon formulaire:

@php
    if($post->id){
        $options = ['method' => 'put', 'url' => action('PostsController@update', $post)];
    } else {
        $options = ['method' => 'post', 'url' => action('PostsController@store')];
    }
@endphp

{!! Form::model($post, $options, ['class' => 'form-horizontal', 'files' => true]) !!}

<div class="form-group">
    <label class="control-label">Nom</label>
    {!! Form::text('name', null, ['class' => 'form-control']) !!}
</div>

<div class="form-group">
    <label class="control-label">Image</label>
    {!! Form::file('image', ['class' => 'form-control']) !!}
</div>

<div class="form-group">
    <label class="control-label">Description</label>
    {!! Form::textarea('content', null, ['class' => 'form-control']) !!}
</div>

<div class="form-group">
    <label class="control-label">Animaux</label>
    {!! Form::select('pets_id[]', Auth::user()->pets->pluck('name', 'id'), null, ['class' => 'form-control', 'multiple']) !!}
</div>

<div class="form-group">
    <button type="submit" class="btn btn-primary">
        Enregistrer
    </button>
</div>

{!! Form::close() !!}

Ce que je veux

Je veux réussir à stocker et afficher mes images correctement

Ce que j'obtiens

Mon erreur à l'affichage ->
"Image source not readable"
"Intervention\Image\Exception\NotReadableException"
"vendor/intervention/image/src/Intervention/Image/AbstractDecoder.php:346"