I was looking to make a 1 frame animation in Unity and wasn’t able to find a guide. In case anyone is curious, this is what I did:
When making a multi-frame animation, you can simply select all of the frames in a sprite and drag them to the prefab. This creates the animation for you. However, if you drag just one frame from the sprite, it will add it as a sprite renderer.
If you would like a 1 frame animation from that sprite, right click the frame you want in the Unity Editor and click Create->Animation
Ta da! You’ve now got a 1 frame animation.