Samsung S8 video auto play in gallery how so I turn it off

[AC Question]

When I was first sorting my new phone S8, a screen popup option appeared when I went to play a video: to auto play the next video. I now want to turn this off, where and how can i do this? Thanks

 

[Ennvyy]

When I was first sorting my new phone S8, a screen popup option appeared when I went to play a video: to auto play the next video. I now want to turn this off, where and how can i do this? Thanks

 

[Razmania06]

Where is this menu?