Get data off wifi sd card in camera to save "onboard' arduino.
I know it can be done with a phone useing auto touch systems to do it automatically ie enter app then touch where new file to download.
I would prefer to use arduino as no phone service anyway and opens up many possibilities.
Anyway of getting a list of files from a remote wifi sd card with arduino.
The place to start will be at the camera. In the unlikely event that you get the camera software sorted, the Arduino stuff is probably easy. I find the vital bit is NFC, and I bet Arduino can handle that too. I undertsand that my Samsung phone has the NFC in the battery, which might be useful.