Why is the song Better Together from Descendants 2 not in movie Descendants?

The song "Better Together" from Descendants 2 is not in the movie Descendants, but rather in the soundtrack album for the movie. It's a common practice for soundtracks to include songs that were written for the film but were not used in the final cut.

There are a few reasons why a song might be written for a movie but not end up in the film itself:

* The song doesn't fit the scene it was intended for. Sometimes, during editing, a scene may be cut or changed in a way that no longer suits the song.

* The song doesn't fit the overall tone of the film. It's important for music to complement the mood and themes of a film, and sometimes a song might not be the right fit.

* Budgetary constraints. Films have limited budgets, and sometimes a song might be cut for financial reasons.

* Creative decisions. Directors and producers often make creative decisions about which songs to use, and sometimes they choose to go in a different direction.

It's worth noting that "Better Together" is a popular song from the Descendants 2 soundtrack, and it's even featured in the movie's end credits. While it wasn't included in the main film, it still plays a significant role in the overall Descendants 2 experience.