Animate a path drawing on screen

I have a landscape and I want to sort of animate a line drawing on the screen showing the path that someone took. I followed a blueprint tutorial and managed to create the line using spline mesh components, but I cannot think of a way to animate this path drawing on screen. (For After Effects users, think basically animating a trim path, or C4D users, think animating the end of a sweep). In the photo you can see the line, I just need to figure out how to draw it on.

I’ve also tried animating the alpha of the material, but each chunk of it gets a new material, so it ends up just animating small sections on all at once rather than the entire path. Any ideas? Thanks!