There are two common reasons why interaction/animations do not render in the browser but they work in Sketch:
Make sure that your artboard/group/symbol is not marked as "Exportable" in Sketch. Anything marked as exportable will be uploaded as an image by Anima, breaking all interactions
Make sure that the component that triggers the interaction is not under another layer. Even if the layer on top is hidden, it will be rendered by the browser as being "on top" blocking all interactions
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