Block is not executed.

I have a problem with the “play” method of the video player. As you can see in the image, after clicking on an item in the list it takes the source of the file if it is passed to the video player, then it is called to the “play” method but the video is not loaded to the player, but if in the “play” block I right click -> Do It, it plays the video.
What I want is that the method is called when I have the source and do not have to do Do it.

PS: I already tried generating the APK and it does not work.

What if you put the iniciar block inside the url block so just below the origen como block. I hope i am reading your blocks correctly.