Hey, just wanted to make this quick forum post if people are stuck with their WebGL builds getting stuck at 90% in Unity 2020. To fix it I went to Edit - Project Settings - Player - Publishing Settings, and change compression format from Brotli, to disabled. This worked for me so I hope I can help other people with this same issue.
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You really helped me a lot, thank you.
Worked for me too, thanks!
Doesnāt help in fact. Well yes, it can load from my local host this way (when I pick the Build and run option) but when I upload the build to web, itās always stuck on 90% and thatās all.
(And Iāve tried many tips found online but no one hepled. Now Iām kinda confusedā¦ )
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Hey! did you find a solution, Iām having the exact same problem, running on local host but not on website. thanks!
I am also facing the same problemā¦ Working in localhost but not in itch
Same problem here 
Think Iāve tried all possible combination of build setting (player setting).
I had the same 90% problem when trying to run a minimal WebGL scene (cube, light, camera) from Unity 2021.3.11, which ran fine on my local host but not from a remote machine. None of the above fixes helped, and it was likely server configuration. I found that placing the attached file in the /Build folder fixed the problem for me. (remove .txt extension, added for uploading) This modifies the server (in my case IIS) configuration with a few needed mime types.
Hope this helps someone still having this problem. Iām not sure exactly where I found this config file online but it was very helpful so thanks to whomever!
9393248ā1314320āweb.config.txt (1.25 KB)
Having this issue in Unity 2022.3.17f1 on Unity Play via the WebGL publisher.
Read here: