What is libraries and how how we use that in Extension

[Aquib_Khan]

@Faraz_Firoz

When the next update release

@Know_About_IT

Soon is what I can say .........

how do I change the SDK version to 30?

The goal is to release the update on Aug 1. If you'd like to test in the meantime, however, you can load your project into http://ai2-test.appinventor.mit.edu to try out the new functionality. You can read more about what's available in the upcoming release here: