animation - Grease Pencil Keyframes not visible in timeline - Blender Stack Exchange

I am very new to blender, working on my first project. I am trying to combine a 3D model, animated using an armature, with some hand-drawn animation, using grease pencil. I started with the model

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Creative Coding in Blender 2.92: A Primer, by Jeremy Behreandt

Dope sheet is completely empty. I how to bring back the keyframe so I can edit them? Please help : r/blenderhelp