Aspose.pdf "invalid file format"

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C#3.5

Aspose

AWS

.NET-Core

I am trying to get a pdf document using the stream and I get as "Aspose.Pdf.invalidPdfFileformatException: 'Incorrect file format'"

What I have tried:

<pre>internal async void ExtractImages(CloudFilePath sourcePath, string filePath, CloudFilePath outputFilenameTemplate, int startPage, int endPage, int dpi)
        {
            var fileStreamContainer = await this.fileSystem.ReadFileAsync(sourcePath, default);
            Stream fileStream = new MemoryStream(fileStreamContainer);
            string extension = Path.GetExtension(filePath);
            var pngDevice = new PngDevice(new Resolution(dpi));
            Document doc = new Document(fileStream);

            using (var document = new Document(filePath))
            {
                for (var pageIndex = startPage; pageIndex <= endPage; pageIndex++)
                {
                    using (var stream = File.Create(outputFilenameTemplate.ToString()))
                    {
                         pngDevice.Process(document.Pages[pageIndex], stream);
                    }
                }
            }
        }

I get the error message in the

Document doc = new Document(fileStream);

line of the code. Not sure what I am missing.
I have uploaded the pdf which I also made sure by getting the extension, which also returns as pdf. In the above the filepath is

var filePath = Path.Combine(amazonConfiguration.LocalStack + sourcePath.ToString());

Can anyone help me to fix this issue.