Blender Model Not Updating Prefab

I have a game I am working on. I have a blender model in it. I created a GameObject and made the model a child of it. I then created a blank prefab and dragged the gameobject onto the prefab. I then dragged the prefab into the scene.

Now if I double click the model it brings up blender. I make changes to the model and save. I go back to Unity and it doesn’t update the prefab. The model is updated, but not the prefab. How do I get the prefab model to update?

You would in this situation just have to drag the updated GameObject onto the prefab. Updating the prefab in this way should update any GameObjects in the scene that are still blue and linked to it, but it doesn’t work the other way around.