Ah! I understood, thank you so much for the sample code! I will reference this.

Thanks for the reply! I'm sorry, but are there some guides or informations about it for understanding? I found this document, but I need more informations. VideoMaterial

Thanks for the reply! I will check this!

I understood, thanks for the reply!

Ah I understood, that would be much better! Thanks for the reply!

I understood! Thanks for the reply!

I got it, thank you so much!!

So I want to ask that if it's possible using ARKit and Reality Composer Pro together like the way i tried.

Thank you for the reply, it was so much helpful! I tried this again adding button in the scene to send notification to the entity(has OnNotification) and it worked!! After this, I also tried to use Object Tracking(ARKit) to send notification to play Timeline. First of all, I was going to load Immersive scene when object tracking worked. (but when tried to load the scene after object tracking, it failed..)

Ah, I understood. Thank you for your answer!