Having problem saving a procedual build LevelSequence as asset

Development Cinematics & Media
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Hi, every one, this is my first forum.
I am having trouble when saving a Level Sequence pointer as a asset.
Here is what i am doing below:
1、 NewObject a level sequence,and call the Initialize() function.
2、Add UMovieSceneSubTrack UMovieSceneCinematicShotTrack as master track to the levelSequence, and add a empty CameraCutTrack.

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3、Add a shot to ShotTrack and another LevelSequence pointer to the SubTrack
4、Save as asset using the code:

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image1987×694 121 KB

The return value was true but I cannot open the asset file from editor.
How could I fix that ?