When “Indivisible” screened for a crowd at Lincoln Center as the opening night selection of its annual “Open Roads: New Italian Cinema” series, it had no U.S. distribution plan. In late 2016, it had screened in higher-profile slots in Venice and Toronto, where buyers paid no heed.

But at Lincoln Center, the movie — a seriocomic story about 18-year-old conjoined twins pursuing a music career (real-life twins Angela and Marianna Fontana) — played through the roof. That was when Ira Deutchman saw its potential.