QHelp! My timeline doesn't play. What's wrong?
First, check that you dragged a layer and not an image into the Timelines panel. Then make sure you have checked the Autoplay check box. Is the animation bar starting at frame 1? If not, your animation may be playing empty frames before it gets to your content.
I'm right-clicking in the Timelines panel, but I don't see the Insert Keyframe command in the context menu. Where is it?
You need to right-click on an individual animation bar to get the context menu to appear. You can't click on the top of the playback head or the frame numbers. If you continue to have trouble, hold down the Ctrl key (Command key on the Macintosh) and use the keyframe cursor to add keyframes.