It was hell for getting my leaderboards working because I had to 1) make changes 2) export 3) ZIP the files 4) upload to itch 5) test on the web 6) REPEAT until I finally figured out what was wrong.
I think I found a slightly easier way when I was trying to do something web related and I just used my own site to put the raw folder in (you don’t even need an actually site you can just open it through your computer) it that is any help