This was a clip from the trailer of the movie “Django Unchained.” (LOVED this movie!) I created this GIF by downloading the trailer from Youtube and singling out this section by trimming it in Quicktime. I then went to Photoshop, imported the clip into layers, and adjusted the amount of time it took between layers (0.05 seconds). Finally I saved it as a .gif by going to File–>Save for Web and Devices–>Save.
The challenge that sometimes occurs is getting the file size down to a certain number of MB; if the number is too high, it wont upload anywhere! Mine was originally 3.4 MB, but I turned it down to 1.5MB by changing the size and reducing the amount of colors. (You can adjust all these settings after you go to “Save for Web and Devices”)