I the Jaen Traffico website is similar to the Malaga Traffico website you should find a list of the required paperwork on there.
BUT different offices and different officials interpret the rules differently.
The need for a medical being a classic case where sometimes they ask for it and sometimes they don't.
When we exchanged our licences I took the required photos with my digital camera and printed them out via my computer to my ink jet computer. The official refused them as they had been printed via a computer.
He told me to go to the local photo place and get them done there.
So they took our photos with their digital camera and printed them via their computer onto their ink jet printer.
The official happily accepted them even the the quality was inferior to the ones I supplied.
Cheers
Gerry