liwo/app/Utilities/Avatar/DefaultConversionFileNamer.php

<?php

namespace App\Utilities\Avatar;

use Spatie\MediaLibrary\Conversions\Conversion;
use Spatie\MediaLibrary\MediaCollections\Models\Media;
use Spatie\MediaLibrary\Conversions\ConversionFileNamer;

class DefaultConversionFileNamer extends ConversionFileNamer
{
    public function getFileName(Conversion $conversion, Media $media): string
    {
        return $media->model->getKey();
    }
}