Connect App not reloading

Jira Development Jira Cloud
1

I’m creating a Connect App, and followed the instructions and was able to get an item added to the Project Sidebar once. But after I changed the .html with something other than display “My Project Page”, Jira doesn’t seem to be “reload/refreshing/pulling” the contents from my local server, even after uninstall/installing.

Changing the contents of the atlassian-connect.json file is reflected in the Jira UI (sidebar), and the http-server logs shows it doing a “GET /atlassian-connect.json” during the install.
But the log only showed the one time it did the “GET /project.html?projectKey=xxxxx”

atlassian-connect.json

 "jiraProjectPages": [
            {
                "key": "hello-world-project-page",
                "name": {
                    "value": "Test Importer"
                },
                "url": "/project.html?projectKey=${project.key}",
                "iconUrl": "/images/icon.png",
                "weight": 1
            }
        ]

project.html

<!DOCTYPE html>
<html lang="en">
    <head>
        <link rel="stylesheet" href="https://unpkg.com/@atlaskit/css-reset@2.0.0/dist/bundle.css" media="all">
        <script src="https://connect-cdn.atl-paas.net/all.js" async></script>
    </head>
    <body>
        <section id="content" class="ac-content">
            <h1>My Derpy Page</h1>
        </section>
    </body>
</html>

Shouldn’t uninstalling/installing the app force Jira to refresh its page?
The tutorial at https://developer.atlassian.com/cloud/jira/platform/getting-started-with-connect/#next-steps doesn’t describe the development lifecycle, like its describe for Forge apps (e.g. forge tunnel ). What is the proper way to update after changing html?