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 "Keying set" 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.