Hello, I have a problem with the video display screen

From the picture, I want you to press Play Video 1 Play Video 2 button.
Play Video 3
and let the video show only at VideoPlayer1 thanks

Show your (relevant) blocks.

I have now changed my building plans. To make it easy for newbies like me.

Hello Krit
Put your video titles in a List View or List Picker instead of using buttons. You do not need two Screens!
Where are the videos stored?

Because the website does not allow uploading large files. So I edited the app using an APK editor to replace my large mp.4 files.

Explain where exactly your problem is.