ok, so i have to change the name of the file? then i submit it?
Viewing post in Non UTF-8 Encoded characters (Warning for all users)
As well as resource files in your game. So if an image file has one of them, it'll cause the same issue.
So it's better to avoid using them in the name of anything in your game files. But if you run into the issue, go through your game folder and change those characters if you see them, as well as the game filename. Then you'll have to go into your game resources tab and fix the path of any broken resources to match the new names you gave the file. Then export the game again as an HTML5 game and reupload it to itch.