Image Size: Another common cause of GIFs not playing on WordPress is the image size.However, they can also interfere with the animation of GIFs and cause them not to play. These plugins are designed to optimize images and reduce their size to improve website speed. Image Optimization Plugin: One of the most common causes of GIFs not playing on WordPress is the image optimization plugin.Common Causes for GIF Not Working in WordPress There are several common causes that could be the reason for this issue. Understanding the Issue: WordPress GIF Not Playing