ExAws.S3.upload_part

You're seeing just the function upload_part, go back to ExAws.S3 module for more information.
Link to this function

upload_part(bucket, object, upload_id, part_number, body, opts \\ [])

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Specs

upload_part(
  bucket :: binary(),
  object :: binary(),
  upload_id :: binary(),
  part_number :: pos_integer(),
  body :: binary(),
  opts :: [encryption_opts() | {:expect, binary()}]
) :: ExAws.Operation.S3.t()

Upload a part for a multipart upload