Estou nesta luta também! Conseguiu realizar tranquilamente? Caso afirmativo, com qual versão do plugin FG?
I'm in this task too! Did you manage to do it? If so, what version of the FG plugin?
Thanks! I'm hoping this version will save me. The version I'm using, 3.61.2, isn't migrating all the featured images, despite copying them to the library.