That’s a good question. I have both a D7100 w/WU-1a and a D7200. The D7100 doesn’t appear to have a separate menu to select images for upload like the D7200 has and as you indicated the D7100 doesn’t let you go into the playback menu when WiFi is on. I tried turning the D7100’s Wifi off and seeing if the playback menu has an option to select files for upload (like the D7200’s playback menu does) and it doesn’t appear to be there. That’s a shame. I’ll have to add this to the FAQ.