“America is a place where people have freedom to move where they want,” says filmmaker Jason DaSilva “At least that’s how it’s supposed to be.” But as DaSilva shows in his new Op-Doc, “Mapping the Disability Trap,” the way healthcare works in the United States can end up denying people with disabilities that freedom. The film follows DaSilva on a spirited investigation of a maddening Catch-22 that prevents him from moving to another state to be closer to his son — and still get the care that his multiple sclerosis requires. In a sense the film is a heartbreaking expansion of DaSilva’s previous Op-Doc, “The Long Wait,” which showed in excruciating (and humorous) detail how hard it is to get around New York City in a wheelchair.