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Unable to loan app.index_string Template for multipage app

Attempting to load a basic html navbar to the top of all of my web pages,
I’ve added an
app.index_string = ““some html””
in to my my, but nothing comes up however the defined layouts in apps still display.

file structure
├── apps
│ ├──
│ ├──
│ ├──
│ ├──
├── requirements.txt
└── static|── base.css
import dash
import os

from flask import send_from_directory

app = dash.Dash()
server = app.server
app.config.suppress_callback_exceptions = True
app.scripts.config.serve_locally = True

external_css = [

for css in external_css:
app.css.append_css({“external_url”: css})

def static_file(path):
static_folder = os.path.join(os.getcwd(), ‘static’)
return send_from_directory(static_folder, path)

Can we see the index_string ?