I have a Canon 6d & a Canon T31 .. I also have a NeewerTT560 Speedlite 2 Yongnuo RF-630 C ... I am having trouble making the flash work with the triggers.. I had it once.. on the T3i.. But now I cant get it to work properly on either one.. If you had any suggestions? Everything has new batteries.. Ive even changed the settings in the cameras.. But still nothing..