Just a follow-up post. The HTML folder is no longer the default output path when launching the project online. Detail see here. So keep the .js files and sources as where they are in local should not be an issue. I think what helps may be the All I had to do was to change the status of the experiment to Inactive, and then back to Piloting. I still put all my files just in the parent folder. Try inactive and then pilot again. This helps me solve the problem.