It might be too late but in case someone else is wondering: If you go into the blueprint of the Sky_Sphere, there’s a function called “Refresh Material” If you bring that whole function into the EventGraph and create a timeline you can drive the colors and stuff (Just replace the variables in the tree by the outputs from the timeline), but from there. Otherwise what happens is that you get changes in your viewport that do not translate into Game Mode.
I’ve found out that with Blueprints that have references to other stuff in the scene, animating in the sequencer is not very useful.
And, Hi Kim, we met at GLAS! I was your Installation assistant.