HOW TO ADD GIFS : BACKGROUND
MASKING GIFS : TRANSPARENT GIFS : BG GIFS
At this point, If you read the transparent gifs, you'll know how to do this.
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Layer > Duplicate into > Your graphic
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Make sure to move the middle dot for no glitches. (Shown Below)
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This time, do Layer > Arrange > Send to the Back. This will brijg your gif back! Or you can do this (Image below)
(Drag the Gif layer by holding it down and moving it to your pleasure.)
Result