Descendants: School of Secrets (2015)

Be good, Auradon... because someone's watching.

An unidentified girl (Lonnie) sets up a hidden camera to capture Auradon Prep's secrets. Her goal is to expose the "real" Auradon and release hidden camera footage to the public. But when Prince Ben announces that villain kids are on their way to Auradon, the hidden camera begins to reveal all sorts of attitudes, secrets, and anxieties before the villain kids' arrival.