Aws::S3::Errors::BadDigest while trying to store a Tempfile

I have the following snippet:

tempfile = Tempfile.new(export_file.filename)

begin

  tempfile.write(contents)

  file_storage_service.store(export_file.filename, tempfile)

ensure

  tempfile.close!

end

And the method is as follows:

def store(filename, file)

  client = Aws::S3::Client.new(options)

  object = Aws::S3::Object.new(bucket_name, filename, client: client)

  object.upload_file(file)

end

My issue is that I seem to get a error on one of my cloud machines, but locally this works as expected.

I believe the tempfile is unlinked while the method is being called, resulting in AWS comparing two different digests, but I'm not very sure about this. I have Ruby 2.1.6 on both machines, the local one running OS X and the cloud one Linux.

What can I do to fix this? And what's the cause of the problem?

P.S.: I've tried both and on the tempfile, with the same results.