Video Editor - Can't Draw Mask

I can’t draw my mask in the video editor.

I have tried it in both the motion tracking and the UV image editor.

I made sure I was holding control and left mouse click, and not control and right mouse click.

I made sure it said Mask and not Tracking.

I made sure it wasn’t on grease pencil.

I’m trying to copy the instructions from a tutorial but I’m not allowed to post links yet.

I’m sure the problem is something simple like I have a box or option checked that shouldn’t be.