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Keyframe-capable inspector rows include previous, diamond, and next controls. The diamond adds a point at the current whole frame or removes the point already there.

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Add the first point

1

Select one layer

Seek inside its active interval and open the relevant inspector section.
2

Set the initial value

Establish the layer’s intended appearance at this frame.
3

Choose the diamond

The new point captures the currently evaluated value and begins a track. Its initial easing is linear.
4

Move to another frame

Seek to the next meaningful beat, then change the property or add another point and set its value.
5

Expand the lane

Confirm both points, their frames, and the interpolation between them.

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Capturing evaluated value

When adding a point to an existing track, the editor evaluates the property at the insertion frame and stores that value. This avoids an immediate visual jump merely from inserting a keyframe.

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Remove one point

At a frame containing a point, the diamond becomes active. Choosing it removes only that point. If the track becomes empty, the property returns to its base value and the empty map entry is cleaned up. Previous and next buttons seek to adjacent points and reveal the relevant timeline region. They disable when no point exists in that direction.
A point can exist at the layer’s end edge for interpolation bookkeeping even though the layer is not active at that exclusive output frame. Inspect the final visible frame as well as the endpoint.
See edit keyframes and keyframe lanes.