Merge file chunks

How do I merge the file chunks uploaded by filepond.

https://pqina.nl/filepond/docs/patterns/api/server/

This is what I tried Process is where I initialize the temp folder

public function process(Request $request)
    {
        $folder = uniqid() . '-' . now()->timestamp;

        TemporaryFile::create([
            'folder' => $folder,
            'filename' => '',
            'original_filename' => '',
            'total_file_size' => $request->header('Upload-Length')
        ]);

        return response($folder, 200, [
            'Content-Type' => 'text/plain'
        ]);
    }

Patch is where I send the chunks

public function patch(Request $request)
    {
        $prefixPath = 'videos/tmp/';
        $folder = $request->patch;
     
        $filename = '/part' . now()->timezone . str_pad($request->header('Upload-Offset'), 20, '0', STR_PAD_LEFT) . '.part';

        Storage::disk('local')
            ->put(
                $prefixPath . $folder . $filename,
                $request->getContent()
            );
        return true;
}

Final Merge

public function merge(string $folder)
    {
        $directory = 'videos/tmp/' . $folder;

        $files = Storage::files($directory);
        $files = Arr::sort($files);
        $firstChunk = Arr::first($files);
        $remainderChunks = Arr::except($files, 0);

        // dd($firstChunk, $remainderChunks);

        $wholeFile = $directory . '/FinalVideo.mp4';
        Storage::disk('local')
            ->put(
                $wholeFile,
                Storage::disk('local')->get($firstChunk)
            );

        foreach ($remainderChunks as $key => $chunk) {
            Storage::disk('local')->append($wholeFile, Storage::disk('local')->get($chunk));
        }
    }