So ...

As I said, you can't use the plugin (embedded iframes) on WA hosted sites. Instead, you'll have to grab the actual image URL.

Go to Gliphy, find your image, click the "Copy Link" tool ...

... and copy the image link under "GIF Link":

Next, open your post/page, click "Add Media", select "Insert from URL" and simply paste the image URL:

And that's it ... After adding the new GIF file, simply save (publish) your post/page and you are done. You can visit your site to see the result ...

As you can see, it's extremealy easy to add/display cool, topic-related animated GIFs without slowing down your site.

And that's it my friends!

If you have any comments, further questions or update requests please don't hesitate to react! Like, comment and share!

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Thanks for your time!