Wifi direct should work between these two devices without an app. I may resort to using this though if I cannot get the native tool to work.
FYI, many of these apps say they are wifi direct but they are not. They just turn one device into a server and still need to be on a LAN to work. That means any files sent need to be sent to a rounter from the source then down to the target. That is two trips for one file. Real wifi direct is a one hop xfer so it should be 2x faster than using the router. Either way is faster than NFC or bluetooth though .