No, only one by one in upper feeder.
I recently made an edition on 190 copies, 24x27" on Canson Rag Photographique from 24" rolls on our 9900.
I stacked them with tissues between, and 20-25 sheets on top of each other, makes them flat enough.
But of course smaller A3 haven't that weight. Using "fresh" rolls also helps, they simply don't curl that much.
I would take a tour to a 4900 reseller, take 20 sheets of your paper of intend, load them in the tray and just print some to see
if the printer grabs and works properly,
/Sven