Sorry about that. I will update the image right away.
Here is the blueprint graph anyway:
Important note: It still has the limitation to only update the first material ID. If you have multiple material ID’s, this system will not work for that.
Which engine version do you use? If you want more functionality I may be able to create a blueprint and send it to you, which you can put in your content folder and works out of the box (that is, why I would need your engine number) :). This above is just a hack job and basic in it’s setup.