School of Secrets, on Disney Channel (TV) / Watch Disney Channel & YouTube (online)
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This is a series of 23 shorts, each under 2 minutes long, which aired on Disney Channel as well as digital platforms between July 2 and July 26, 2015, leading up to the July 31 premiere of the TV movie Descendants. (I didn't watch the shorts until September of 2017, prior to watching the movie for the first time on DVD, because I didn't have access to Disney Channel.) At the time, I put my review in my webisodes section, but when I later started a section for microseries in my TV reviews, I moved it there (but kept a link to the review in webisodes).

It begins with an anonymous girl at Auradon Prep setting up a hidden camera to spy on the other students (all descendants of characters from various Disney fairy tales). We never clearly see anyone's faces, but we do see and hear a lot of things that go on, mostly typical high school stuff, but with a slight fairy tale twist. Early in the series, Prince Ben announces that several students from the Isle of the Lost (themselves descendants of fairly tale villains who had been imprisoned on the island) would soon be admitted to the school. A lot of what the students who are unwittingly being filmed talk about has to do with their negative attitudes about this declaration. Meanwhile, whoever set up the camera has been posting her videos online, and students at Auradon Prep are beginning to wonder just who's responsible for this.

Anyway, I found the series mildly interesting, I guess, but not really as informative as I might have wished, considering I don't yet know anything about any of the characters.