.incani. It can either be opened from the
Viewdrop-down Menu on the top panel of Incari, or by right-clicking on the Menu bar in Incari and clicking on Animation Editor from the drop-down list, or simply by double-clicking an Animation Asset in the Asset Manager.
Add Keyframefrom the context menu. This will create a Keyframe at whatever time the playhead is currently on. The curve handles can then be adjusted to fine-tune the intermediate frames.