I doubt it has to do with the blocks, because it works perfectly fine on the Live App, and WebPreview, (within editing), just the preview project detail page has this problem… The audio just doesn’t play on the preview in the project detail page, but every other method of testing has audio. (including WebPreview within the editing Page). But heres the link anyway: Thunkable
BTW, here’s why I created the app: [Solved] Creating a timed alert with no buttons