I have the following problem: A java InputStream object is downloaded from an S3 storage and then passed to MinIo. Before I pass the InputStream to MinIo a create a new InputStream (ByteArrayInputStream) from the one I dowloaded from S3. Basically, the aim is to download a zip file which has .zip.p7m extension (signature has been applied) and store it into another storage.
Here is the code:

try (InputStream downloadedFileS3 = s3Service.readFileFromS3(body.getAckPath(), Modalita.ACK)) {

            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            byte[] byteArray = new byte[4096];
            int length;
            while ((length = downloadedFileS3.read(byteArray)) != -1) {
                buffer.write(byteArray, 0, length);
            }

            byte[] bytes = buffer.toByteArray();

            // Create a new FileInputStream
            InputStream newInputStream = new ByteArrayInputStream(bytes);
           
            //Upload file on MinIo
            minIoService.uploadFile(bucketName, completeStorageFileName, newInputStream);

BucketName and completeStorageFileName are given.

Thing is that I found the file on MinIo but I cannot open it as folder. Actually, I am able to open it with 7zip and see the content but I am not able to open it as folder when I chang the extension from .zip.p7m to .zip.
Anyone could please explain why this is happening?
Here is the code of the minio.service.uploadFile method:

public void uploadFile(String bucket, String source, InputStream file) throws MinIoCheckedException {

        try {
            minioClient.putObject(
                    PutObjectArgs.builder()
                            .bucket(bucket)
                            .object(source)
                            .contentType("application/octet-stream")
                            .stream(file, file.available(), -1)
                            .build());
        } catch (Exception e) {
            throw new MinIoCheckedException("Errore upload file su minio", e);
        }

    }

I am sure the file on S3 storage is not corrupted because I can open It correcly…