How to use PlaybackState?

For example: What is the right format: Is it Tween:Playing()? Or Tween.playing?

I found out how. Thanks for incoming help guys!

There is no such method Tween:Playing(). Every Tween object has a PlaybackState property which is read only and always maintains one of the PlaybackState Enums. According to the description of the property found on the Tween class documentation:

“PlaybackState describes the current stage for the Tween animation. A description of each state can be found on the page for the PlaybackState enum. It can be manipulated through other Tween functions, like Tween/Play|Play