Help movinga video clip from Facebook to s4 galaxy gallery

[Claremont]

Hello: I am really frustrated with Samsung since speaking with their "techs" who tell me that I cannot move video clips sent to me on Facebook to my photo gallery. I was able to do it with my Apple phone. Why is is that a phone like the S4 can't do this when it does every thing but make your dinner. Can anyone out there help me with this dilemma? I'm not talking about transferring a full length movie, just a video clip that someone takes with their camera and shares with me. Sometimes the clip is something I'd like to keep. There must be a way to save the video clip that one receives on Facebook. I would appreciate assistance from anyone out there familiar with transferring video clips from Facebook to either the S4 gallery or to some other app on the phone. Thanks!!!