It's at Cupid and Psyche#Classical tradition. There's a footnote. It's meant just to provide a context for why the tale was known and allegorized in the 5th and 6th centuries, but then resurfaces only in the mid-14th century among the Florentine humanists. The section is on literary reception, not the transmission of the text as such, which I would see as belonging properly to the article on the Metamorphoses as a whole (I regard it as unfortunate that we go with The Golden Ass).