Sorry if this is annoying or an obvious question!
I've just uploaed my first zine here: https://jamesmaclaw.itch.io/how-to-complete-your-first-cryptic-crossword
But when I click 'run', it gives a 'loading zine...' text that doesn't seem to go away no matter how long I wait. Is it potentially something I've done wrong when editing the alt text in the zip file? I can't think of any other things I've tampered with.