Bootstrap submenu not working when linked externally - html

Question

I have a bootstrap 4.3.1 navbar with a submenu and it works fine when I include it in the navbar. However, according to the documentation, I should be able to link it externally. When I do that, the general toggle button works, but the submenu no longer works. Any ideas why this is happening?
Here's my navbar:
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap#4.6.0/dist/css/bootstrap.min.css" integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l" crossorigin="anonymous">
<nav class="navbar sticky-top navbar-dark bg-dark">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<a class="navbar-brand" href="">Brand Logo</a>
<!--NAV BAR -->
<div class="collapse navbar-collapse bg-dark" id="navbarCollapse">
<ul class="navbar-nav mr-auto">
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-expanded="false">
<i class="far fa-circle"></i> Dropdown Title
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Product 1</a>
<a class="dropdown-item" href="#">Product 2</a>
<a class="dropdown-item" href="#">Product 3</a>
</div>
</li>
</ul>
</div><!-- tag added by community -->
</nav>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#4.6.0/dist/js/bootstrap.bundle.min.js" integrity="sha384-Piv4xVNRyMGpqkS2by6br4gNJ7DXjqk09RmUpJ8jgGtD7zP9yug3goQfGII0yAns" crossorigin="anonymous"></script>
I'm trying to move the entire #navbarCollapse div into a different page and still have the submenu function properly.