Drawing layer only shows up as outlines.

EDIT: I figured out the solution, but I decided to leave this post up in case anyone else has this problem.
Just click the box to the right of the lock in the timeline.

I’ve drawn something, and it looked okay at first. But I must have hit a wrong key by accident.
Now this drawing layer shows only as outlines in the Camera view.
It still shows fine in Drawing view.
It doesn’t appear when I render a movie.
Please help!

help solved 01.png