Hey Everyone,
Here is my new extension that you can use to create Revealing animation splash for you app and very easily.
There are total two blocks only have discussed below -
This block can be used to set the arrangement for intro and arrangement where to end the animation.
This block can be used when you want to start the animation to close the intro..
Subscribe to my channel for more stuffs and to support me too..
Thanks You 
Since you are offering a free extension - aia, please upload it to the community. Link in youtube leads to telegram. I'm closing temporarily the topic till you edit your post
i have added google drive link in youtube video description
This project was saved with a newer version of the App Inventor system. We will attempt to load the project, but there may be compatibility issues.
Not charge
The aia linked is probably a Kodular aia project, which will not load in AI2.
See here an AI2 demo project
IntroZ_Demo.aia (20.1 KB)
Try this:
Can't help with the original aia, but I did an example a few posts up.
