Unable to update firmware?

I've connected to my Shelly Flood and added it to the cloud. I try updating the firmware in the app and it doesn't work. I used the url builder here on this site to try doing it that way: http://mydeviceIP/ota?url=http://archive.smarthome-forum.eu/v1.9.2/SHWT-1_build.zip but I just get this response:

{"status":"updating","has_update":false,"new_version":"","old_version":"20190723-093815/???"}

What am I doing wrong?

Nevermind - I guess the url worked fine - I thought because has_update was false and new_version was blank that it didn't work. But it did.