Development of SWFUpload stopped many years ago. It has been deprecated in core since WordPress 3.3 (2011) when we switched to using Plupload. Additionally the latest updates in some browsers default to disabling Flash. It’s finally time to say Goodbye There are several popular plugins that appear to still use SWFUpload after so many years of it being deprecated: (For the full list see If you are using one of these plugins on your site, please contact the authors and ask them to switch to Plupload. Core switched to it… 16 versions ago!
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