How do I make flying enemies?

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I figured all I had to do to make flying enemies was attach a set of wings to them, but doing so just turns them into hopping enemies, not flying ones. How do I make flying enemies? Is there a separate item for it, or is there something special I need to do in order to make the "hop wings" into "flying wings"?
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How I Made A Flying Enemy In Unity FAST - Devlog
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