So, I followed the instructions, but when I go to my project's page, I just get this error:
There was a problem loading your project:
Failed to find index.html
Please try deleting the ZIP file and uploading another one.
On a second glance, it isn't giving the option for the scritch player to be the one playing in the browser, but gives that option for the zip file containing the music.
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Okay, so the problem is that the "download zip" button in the downloadable version of the editor wasn't actually making a .zip file. So I had to extract the contents to a new folder via 7-Zip and then compress that into a .zip file.