Grease Pencil Keyframes not visible in timeline 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, and everything worked as expected, but when I started animating with the grease pencil, the keyframes were not visible in the timeline. As a result, I cannot grab them, arrange them, or view their onion-skinning.
I saw a similar question asked about the Dope sheet, which allowed me to see the keyframes there, but the timeline is still blank. I have a picture of the view, with the grease pencil selected, but with no keyframes visible. For reference: There are keyframes on frame 0, 1, and 20. I cannot see them in object, edit, or draw mode.

I think my problem has something to do with using the wrong &quot;Keying set&quot; since I am using one with LocRotScale for the armature bones, But I am not sure how to change it to a keying set that allows for grease pencil frames. Keying sets are still a little confusing to me in general. I know the keyframes are being created because scrubbing the timeline still shows the different frames in the viewport, but I just can't view them in the timeline. I am most interested in getting the onion skinning working, which I believe is linked to this visibility issue.

Any help is much appreciated. I've been at a bit of a stuck in the project because I cannot figure this out.
I have the exact problem, I have keyframes and there is animation, but the keyframes aren't visible anywhere, not even in graph editor even though the object is selected.
To fix the bug go to Object Mode and create a new grease pencil stroke. When going back to the original drawing keyframes show again.