On the fourth floor at Steinbrenner Field yesterday afternoon, while the Yankees visited the Phillies in nearby Clearwater, chieftains Hal and Hank Steinbrenner and resident legend Reggie Jackson convened with a handful of others in a dark conference room and took in a movie. It wasn’t “Argo” or “Pride of the Yankees” or “The Naked Gun” (still Reggie’s best work). Rather, this was an animated film called “Henry & Me” that has been a long time in the making and serves as homage to the Yankees’ history. It has been so long in the making, in fact — about six years now — that the film’s producers face a potential dilemma: Alex Rodriguez plays a small but important role in the film, hitting a big home run with the help of the film’s protagonist, Jack, a boy battling cancer. Is it OK to keep portraying A-Rod in such a positive light, given the Biogenesis story? Upon viewing the near-completed project yesterday, Hank Steinbrenner, who contributes his voice to the role of his late father, George, said that would be just fine. “I think it doesn’t matter,” Steinbrenner, the Yankees’ co-chairperson with his brother, told The Post. “The move is about a child with cancer and his love of the Yankees. Everybody else is in it, too, Ruth and Gehrig and everybody else, so it’s really a small part of it.