How do you use the plug.parser to accept larger files

I'm trying to upload a file, and I keep getting the file size is too large.

Plug.Parsers.RequestTooLargeError at POST /admin/courses/course the request is too large. If you are willing to process larger requests, please give a :length to Plug.Parsers

I'm new to elixir and pheonix. Is this not how I am supposed to set the plug?

defmodule MonolithWeb.Router do
  use MonolithWeb, :router
  use Kaffy.Routes, scope: "/admin", pipe_through: [:admin, :authenticate]

  pipeline :admin do
    plug Plug.Parsers,
     parsers: [:url_encoded, :multipart],
     length: 200_000_000_000
    plug :accepts, ["html"]
    plug :fetch_session
    plug :fetch_live_flash
    plug :protect_from_forgery
    plug :put_secure_browser_headers
    plug :fetch_current_user
  end

Any help would be very much appreciated. Thank you!

Solution

In Phoenix, the Plug.Parsers plug is placed in the Endpoint by default, so that is probably where you need to add the length option.