How can I upload multiple large files to Google drive API using PHP in chunks?

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PHP

API

google-api

I need to upload multiple large files in chunks using the following code:

The first file of the foreach upload works correctly, but I encounter issues starting before the second file upload.
The return type of $service->files->listFiles is GuzzleHttp\Psr7\Request, most likely because the media upload is deferred with the line $client->setDefer(true);.

I would like to find a solution where the loop waits for each upload to complete before moving on to the next file, similar to a thread. Alternatively, is it possible to send multiple uploads simultaneously (async/parallel)?

What I have tried:

$service = new Google\Service\Drive($client);

foreach ($files as $fileDatas) {

    //Check if a file with this name has already been uploaded
    $is_file_exists = $service->files->listFiles($Params);
    if (count($is_file_exists->files) > 0) {
       return false;
    }
    
    $file = new Google\Service\Drive\DriveFile();
    $file->name = $fileName;
    $chunkSizeBytes = 1 * 1024 * 1024;

    // Call the API with the media upload, defer so it doesn't immediately return.
    $client->setDefer(true);
    $request = $service->files->create($file);

    // Create a media file upload to represent our upload process.
    $media = new Google\Http\MediaFileUpload($client, $request, $type, null, true, $chunkSizeBytes);
    $media->setFileSize($size);

    // Upload the various chunks. $status will be false until the process is complete.
    $status = false;
    $handle = fopen($filePath, "rb");
    while (!$status && !feof($handle)) {
        // read until you get $chunkSizeBytes from TESTFILE
        // fread will never return more than 8192 bytes if the stream is read
        // buffered and it does not represent a plain file
        // An example of a read buffered file is when reading from a URL
        $chunk = readVideoChunk($handle, $chunkSizeBytes);
        $status = $media->nextChunk($chunk);
    }

    // The final value of $status will be the data from the API for the object
    // that has been uploaded.
    $result = false;
    if ($status != false) {
        ...
    }

    fclose($handle);
}