I can find it with the repl link, but for future reference it is a hidden file that can be shown by clicking the three dots and then “show hidden files”. Everything seems as though it should work, the last thing I could think of is try adding an response to the index page.
I think the issue is that you created your code in a Python template, rather than a Flask one. I made a new Flask template, copied in your code, changed one line (see below) and it started a webview immediately.
Oh yep thats why. I did use python isntead of flask. When trying that rn, Im getting ‘requested url not found on the server’. Do I need to change ‘0.0.0.0’ to something?