opnform/app/Http/Requests/UploadAssetRequest.php

<?php

namespace App\Http\Requests;

use App\Rules\StorageFile;
use Illuminate\Foundation\Http\FormRequest;

class UploadAssetRequest extends FormRequest
{
    const FORM_ASSET_MAX_SIZE = 5000000;

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array<string, mixed>
     */
    public function rules()
    {
        return [
            'url' => ['required',new StorageFile(self::FORM_ASSET_MAX_SIZE, [
                'png',
                'jpeg',
                'jpg',
                'bmp',
                'gif',
                'svg'
            ])],
        ];
    }
}