It doesn't give me the option to get a link that way, I've had to make a new tab on my phone, Google search gif images, long press the pic, click View Image, then copy the link that way and paste it in the image box here. That's annoying lol
If I may suggest: try the Google keyboard and/or chrome browser. Both are available in the play store for free and @Alenya Al'Roran says it works for her.
Click on the GIF, and then click the little open in new tab symbol in the bottom right corner. Copy the address from the new tab, and put it in the image insert thing here.