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iOS Mac executable not being created correctly


So I'm working on GameMaker on my Mac and I've been following the steps outlined by this tutorial:
in order to export my game to Steam. However, instead of an executable, the zip it outputs only contains an app.

This would not be so bad, except that this app contains nothing but the splash screen. Meaning, I open the app and it just shows the splash screen for a second or two and then closes again. I can run my game just fine on GameMaker, so I don't understand why it's not exporting correctly.