The making of a Disney animated film is, for the most part, a long and arduous process, full of false starts, speed bumps, and creative dead-ends. Sure, the end result is almost always magical, but the journey to get there is anything but. And it’s a process that’s rarely documented, with an eye towards emotional honesty and creative transparency. But with the new Disney+ series Into the Unknown: Making Frozen 2, filmmaker Megan Harding attempts to make a really-for-real behind-the-scenes documentary, as is evidenced by the brand-new trailer. The trailer emphasizes the …