I’m having the same problem but deactivated all plugins but still didn’t show up under “Plugins” The plugin is activated and installed correctly. On the most up-to-date WordPress.
It seems to be only on smaller images that I get the http error. I can upload a large image, but it won’t post to the page. I tried the plugin and I’m able to upload the smaller images now, but still can’t post the image to the page.
