There are a few errors being discussed in this thread. Please read before commenting.
In order to upload a GIF into the library, the file must be no more than 600px wide and under 5MB in size. While an image may show as the correct file type, there may be a file extension causing the image to not upload. You will need to resave the file in Photoshop if you have it. If you do not have access to Photoshop to adjust the image, we would suggest uploading your GIF to a site to decompress the file. While we do not offer this service, there are external websites that can do this for you, like EZGif
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