ldc-legaulois/app/Http/Requests/Bo/UploadFileRequest.php

<?php

namespace App\Http\Requests\Bo;

use Illuminate\Foundation\Http\FormRequest;

class UploadFileRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     */
    public function authorize(): bool
    {
        return auth('backend')->check() and $this->ajax();
    }

    /**
     * Get the validation rules that apply to the request.
     */
    public function rules(): array
    {
        return [
            'upload' => 'required|image|mimes:jpeg,png,jpg|max:2048',
        ];
    }
}