Use Gif Image in Unity3d

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Unity is not supporting gif. You can use sprite animation .

Use Unity 4 version or above

Goto main menu and select GameObject > Create Other > Sprite

Select the image to make animation .

Goto Inspector

  1. Texture type >Sprite
  2.  Sprite mode > mutliple
  3. Select Sprite Editor > Slice > Type >Grid
  4.  Pixel size ,adjust to suitable size , > Slice
  5. Goto Main menu > Window >Animation
  6.  Select the sprite object
  7. Select Animation window >Add Curve >Save
  8.  Select sprite image > add each slice in suitable Animation frame (0:0 ,0:10,0:20 etc)

for more details please check out : http://michaelcummings.net/mathoms/creating-2d-animated-sprites-using-unity-4.3This tutorial gives the idea about sprite and sprite animation.