Error when merge

[taihojvc]

Hi all, My code sample here:

$slidesApi = self::getCloudApi();
$fileName = "file_2.pptx";
$fileName2 = "file_3.pptx";

    $inputFolder = storage_path('app/public/');

    // Upload original documents to storage
    $fileStream = fopen($inputFolder . $fileName, 'r');
    $slidesApi->uploadFile($fileName,  $fileStream, '24h store');

    $fileStream2 = fopen($inputFolder . $fileName2, 'r');
    $slidesApi->uploadFile($fileName2,  $fileStream2, '24h store');

    $mergeList = new PresentationsMergeRequest();
    $mergeList->setPresentationPaths(array($fileName, $fileName2));

   $res = $slidesApi->merge("test_merge.pptx", $mergeList, null, null, '24h store');

And I get the error is:
Error: Merge. Exception: Error processing presentation file_2.pptx: AmazonS3 Storage exception: The specified key does not exist. Bucket 'aspose.cloud-filestorage-prod'

Does I do wrong config any thing? Please help me this. Thank you