Developing With Elixir (Pragmatic Studio)

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I’m following the same course. At one point when they’re reading the about.html file, they typed the path as “../../page/about.html”, because the handler.ex file lives 2 levels down than the root.
Here is the screenshot.

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When I did the same, it gave me :enoent (file not found), but when I typed the path as “pages/about.html”, it worked.
Is there anything changed in BEAM that it now handles files paths differently? (or what they did differently?)

Here is the function:

  def route(%{method: "GET", path: "/about"} = conv) do
    case File.read("pages/about.html") do
      {:ok, content} ->
        %{conv | status: 200, resp_body: content}

      {:error, :enoent} ->
        %{conv | status: 404, resp_body: "File not found!"}

      {:error, reason} ->
        %{conv | status: 500, resp_body: "File error: #{reason}"}
    end
  end

And here is the files and folders structure:

.
├── config
│   └── config.exs
├── lib
│   ├── servy
│   │   └── handler.ex
│   └── servy.ex
├── mix.exs
├── pages
│   └── about.html
├── README.md
└── test
    ├── servy_test.exs
    └── test_helper.exs