Fix for "Uh oh!" 404 error for Unity WebGL on LDJam page

If you see this:

Screenshot 2023-01-09 at 9.47.42 AM.png

Make sure your .ZIP file is not the archive of the folder, but instead an archive of the files in the folder.

e.g. on OSX, go into the Unity-generated build folder so that you see 'index.html', select all files in that folder, and then right-click -> compress. Use that .ZIP file.

Screenshot 2023-01-09 at 1.50.41 PM.png