I know there is a limit to the size of images allowed to be posted on GatorCountry but have no idea what the limit might be. Have you looked at the size of the GIF being rejected to see if it might be quite large? A science project might be to compare the size of the rejected GIF to one that you have posted in the past. There are a number of free online tools that wiill reduce the size of the GIF. Here is an article listing 7 of the best, according to the writer of the article. Of course, you may have reached the unpublished limit of GIFs that purport to show fishing where anything to do with fishing is overshadowed by some other object(s) shown.
I get that file is too large too, on memes... simple pics with words. But they're no larger than pics In The Summertime thread in the GatorTail Pub & Grill forum.