function onLoad()
  local notes = self.getGMNotes()

  -- default parameters (e.g. scenarios)
  local buttonParameters = {
    label = "Download",
    click_function = "buttonClick_download",
    function_owner = self,
    position = { x = 0, y = 0.1, z = 2.1 },
    height = 250,
    width = 800,
    font_size = 150,
    color = { 0, 0, 0 },
    font_color = { 1, 1, 1 }
  }

  -- return to boxes
  if string.match(notes, "................") == "campaigns/return" then
    buttonParameters.position.z = -2

    -- official campaign boxes
  elseif string.match(notes, ".........") == "campaigns" then
    buttonParameters.position.z = 6
    buttonParameters.height = 500
    buttonParameters.width = 1700
    buttonParameters.font_size = 350

    -- investigator boxes
  elseif string.match(notes, ".............") == "investigators" then
    buttonParameters.position.z = 7
    buttonParameters.height = 850
    buttonParameters.width = 3400
    buttonParameters.font_size = 700
  end

  self.createButton(buttonParameters)
end

function buttonClick_download()
  Global.call('placeholder_download', { url = self.getGMNotes(), replace = self.guid })
end