How to display the uuid in a view

[Naghal]

I'd like to render a table with a download button for each media. I added a column with a link:

<?php

namespace App\DataTables;

use App\Models\File;
use Yajra\DataTables\Facades\DataTables;

class FileDocumentsDataTable
{

    public function getQuery($request, $fileId)
    {
        return File::findOrFail($fileId)->media()->getQuery();
    }

    public function build($request, $fileId)
    {
        return DataTables::of($this->getQuery($request, $fileId))
        ->addColumn('download', function($media) {
            return '<a href="/files/'.$media->model_id.'/documents/'.$media->uuid.'" class="btn-primary" style="height:25px;">'.__('common.download').'</a>';
        })
        ->rawColumns(['download'])
        ->toJson();
    }
}

However, the following error occurs: Malformed UTF-8 characters, possibly incorrectly encoded.
Inspecting the uuid attribute with dd($media->uuid) shows weird characters b"øò└*c╦8EìÅ=uT¿ÅU".
In the dabase, the uuid renders correctly.

I have tried the following without success:
(string) $media->uuid
utf8_encode($media->uuid)
mb_convert_encoding($media->uuid, 'utf-8')