Disappearing Keyframes

My Dope Sheet is usually filled with Keyframes. However, sometimes, when I press random keys, the Keyframes disappear.

Where did they go? What did I do to get rid of them? And how do I bring them back?

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Maybe if you hit alt h in the timeline bar, the problem will be solved

What does Alt + H do? It didn’t do anything.

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Here is a tutorial

They weren’t hidden away at the top either. What I’ve noticed was that each layer had its own row, but they don’t exist anymore. Maybe that’s part of the problem?

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This is very strange

I have found a solution. It seems that clicking on the Stroke element in the Outliner brings it back. I guess the Dope Sheet only shows whatever is selected in the Outliner and the Stroke element got unselected.

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