When making a GIF, simply click on "More Options", go to "Sound" then change it to "Enabled" (whether it automatically plays or the viewer has to tap the audio button)
You need to have Pro, though.
WE SHOULD BE ABLE TO POST VIDEOS(MP4) WITH SOUND; THE "GIFS" ON IMGFLIP ARE ALREADY MP4 JUST WITH OUT SOUND. THAT'S WHY YOU JUST SIMPLY SAVE IMAGE FOR GIFS BY RIGHT CLICKING
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