Swoosh.Attachment.get_content

You're seeing just the function get_content, go back to Swoosh.Attachment module for more information.
Link to this function

get_content(attachment, encoding \\ :raw)

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Specs

get_content(
  %Swoosh.Attachment{
    content_type: term(),
    data: term(),
    filename: term(),
    headers: term(),
    path: term(),
    type: term()
  },
  content_encoding()
) :: binary() | no_return()