Adding Tracks to Sequencer
After creating a Level Sequence, double-click on it to open the Sequencer Editor so that you can begin creating your cinematic.
Above, we have a newly created, empty Level Sequence.
The first thing you will need to do is add a Track type, which you can do from the Track button's drop-down menu.
From the drop-down menu, you will see several Track types you can select from, as well as the ability to add an Actor To Sequencer. The Actor To Sequencer option will enable you to add any Actors that you have selected in your Level (at the time) to Sequencer so that you can manipulate them during your scene.
Typically, if you are creating a cinematic that has characters, animals, creatures, or anything along those lines that will animate and move, you will have a Skeletal Mesh for it, which you will need to add to Sequencer.
For example, we have a Skeletal Mesh of a bear that we have placed in our Level (below). With the bear selected, we can then click the Track button in Sequencer and choose Actor To Sequencer so that we can add it and control it in the Sequencer Editor.
Once we have added our Skeletal Mesh, we can then add Sub-tracks to affect that Skeletal Mesh.
Based on the type of Track you create, Sub-Tracks may be added and the ability to add Sub-Tracks may be available.
Below, we select the Animation Sub-Track and assign an Animation for our Skeletal Mesh Bear to play.