I have an animation of a prefab on my scene that moves fairly fast - I would like to add motion blur to it, but every time I use the asset Motion Blur, it adds a camera to it and the scene camera becomes the camera added to that prefab.
Is it possible to add motion blur on my main camera to only a specific model/tag/layer/prefab?
You might consider adding a Trail Renderer to your object instead. It's a specialized particle emitter that adds a motion trail to fast moving objects, and you have quite a bit of flexibility in what the trail looks like, how long it is, how quickly it disappears etc.