Record and play back the Alembic using an Infinite clip

To control the playback of Alembic, use an Infinite clip on a Timeline Animation Track bound to the GameObject that contains the Alembic Stream Player component.

1. Select the GameObject with the Alembic Stream Player component and open the Timeline window.
2. Create a Director component and a Timeline Asset if you don't already have them.
3. Begin recording, and save keys for the Time property on the Alembic Stream Player component (see Unity documentation on Recording basic animations with an Infinite clip). For example, if the Alembic file lasts 16 seconds, set a key at the beginning of the clip where the Time property is set to 0, and another key at the end of the clip where the Time property is set to 16.
4. Play back the animation using the Timeline Play controls in the Timeline window.

If you want to use the animation in the GameObject's animation state machine, you can convert the Infinite clip into an animation clip and add it to the Animation Controller.