Restart blender or switch between Volumes & VDB's (Top of the addon N-Panel)

Make sure you have an HDRI/skytexture or lights in your scene and that you're on CYCLES in rendered view.

You can animate all volumes and their material properties with drivers or keyframes.

The VDB's are static volumes without any animation - you can however animate the procedural VDB materials to get a moving effect.

Simple right click a value and insert keyframe (hower and press i) or insert a driver.

All presets have a dedicated density slider on the addon N-Panel.