I have a Flutter portfolio app at suragch.dev and then a few other web apps in an apps
subfolder. However, when I push the changes and try to visit the new Flutter app in the subfolder
https://suragch.dev/apps/mongoleditor/
it returns to the root Flutter page. In the past I didn't have this problem. In fact, another flutter app in the apps folder works fine:
https://suragch.dev/apps/mongolcode/
How do I fix this?
I found the answer and will add it below.