Where does the name fluff come from?
The main parts of the functionality are ‘upload’, ‘large’ and ‘files’. Adding an ‘F’ suggests ‘fulf’, but that’s not a word, so we got ‘fluff’. ‘Facility’ is a convenient word beginning with ‘F’ that fits in nicely. ‘Facility For the Upload of Large Files’ becomes FFULF, but if you reverse it, it comes out as ‘FLUFF’. We normally write it in lower-case because capitals can look aggressive, and fluffy things are nicer and more calming!