try this https://atrl.net/forums/topic/4141-tutorial-making-gifs-in-photoshop-cs6/
here you go from that thread
hope it helps!
Once you done that step, go to the folder or wherever you downloaded your video and double click on your video and it’ll then open in Photostop
When the video is open (I’m using the iconic, best video of 2014, ‘Break Free’ by Ari. make sure to set the lil button on Selected Range Only & Make Frame Animation. DO NOT put a check mark where it says “Limit To” because it will ruin your gif, make it slower than it should be, and skip frames.
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