ExAws.S3.Upload.stream_file

You're seeing just the function stream_file, go back to ExAws.S3.Upload module for more information.
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stream_file(path, opts \\ [])

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Specs

stream_file(path :: binary(), opts :: [{:chunk_size, pos_integer()}]) ::
  File.Stream.t()

Open a file stream for use in an upload.

Chunk size must be at least 5 MiB. Defaults to 5 MiB