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I don't get it at all. If I edit the code and press play, the code just reverts back to what it was. My edits never execute.

Are you pressing the play icon in the lower left corner? That is for resuming back to the timeline the of the creator of the cast.

To run the code, press the play icon in the top right corner. When you hover over it, it says 'Run code'.

We clearly have some UX challenges here :)

Ah, that was it, thanks. Yeah, your UX is non-great :(