Thank you for your help! The cloud speed works when I set it from the material instance from the editor. But I was wondering if I could increase and decrease the speed from the blueprint during gameplay.
I have this lerp macro that I call from the blueprints. However when I lerp the CloudSpeed for example from 1.5 to 0.5 clouds in game start moving backwards until the lerp stops. Then they start moving in the right direction at the right speed.
How would I correctly lerp the CloudSpeed while it is multiplied by the Time node?