sfp_api_laravel_ginastica_cerebro/app/Http/Requests/MediaRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class MediaRequest extends FormRequest
{
    public function rules(): array
    {
        $rules = [
            'name'      => 'required|string|max:255',
            'origem'    => 'required|string|max:255',
            'origem_id' => 'required|integer',
            'file'      => 'sometimes|file|mimes:jpeg,png,gif,pdf,mp4,mov,avi|max:20480',
        ];

        if ($this->isMethod('POST')) {
            $rules['file'] = 'required|file|mimes:jpeg,png,gif,pdf,mp4,mov,avi|max:20480';
        }

        return $rules;
    }
}