Phantom webpage!

Hello

I have been playing around with a Adafruit Feather HUZZAH with ESP8266 WiFi.

Many weeks ago, I uploaded a demo webpage. All is well.
It created a sub folder called 'Data' in my sketch folder.

Now.. I can't get rid of this webpage.
I have entirely deleted the data page, and uploaded a blank 'Spiffs' file. Tried both 3M and 1M memory sizes.
It warns me I am uploading a blank file, and then it uploads fine.

BUT, the damn webpage is still there!
It's displaying my demo HTML (which is not in the Arduino sketch by the way).

Any idea where the heck this data might be hiding, or how to clear it?

Any idea where the heck this data might be hiding

If we told you, it couldn't hide there anymore.

or how to clear it?

Fix your code.