Why is the configure button disabled

I want to change the json file that i uploaded at the last time configuration. Now i need to upload a new json file but configure is disabled

Hi, this is a known issue and a fix has been found. Here’s a possible workaround in the meanwhile:

On Windows press Ctrl+F5 (If that doesn’t work, try Shift+F5 or Ctrl+Shift+R), on Mac Cmd+Shift+R