Why is my character made with grease pencil grey in the video editing tab?

I coloured my grease pencil character red with the tint modifier

But when I add the scene strip to the video editing tab, it turns grey:

And when I’m rendering it, everything’s normal (my character is red)

Why is this happening?

In the right hand side panel (N), in the View tab you have to change the “Scene Strip Display” to Material Preview or Rendered. Not 100% sure, but for the modifiers to show, it might have to be Rendered