I am having lots of trouble with my Neewer 750 II flash. I attached it to my Nikon D750 and the red light was pulsing, but later it just stayed fixed and the pilot button is not working either. I am not sure if it's an internal problem or my camera settings (I am new to flash so I am not sure how it is supposed to be).
A few months ago I used it in TTL and it worked just fine, but right now I've tried several options, including resetting my camera settings, resetting my flash settings, silent mode, changing my shutter speed, but nothing.
The flash seems to be communicating with my camera because all the info from it is reflected on the flash screen, but I don't know what else to try.