does not work

Hi @nilsbyte!

I am sorry that the plugin is not working for you. I wanted to clarify the intent of the plugin to hopefully clear up any confusion.

This plugin is not intended to prevent that error from displaying. That error is in place to make users aware that something on the server failed during the image upload process, which spans from the upload itself to WordPress creating all of the registered image sizes.

This plugin will only disables the feature added in WordPress 5.3 that generates an additional 2500px wide version of the original image that is used instead of the true original image size. This helps save resources when generating smaller image sub sizes (this is easier to do with a 2500px image than a 6000px image), and helps with site performance by serving a smaller image to users.

Sometimes, as a result of disabling this feature, the post-processing will succeed on some setups. But the intent is to allow sites to continue linking to full, original resolution images on the site when desired.

If you still feel this plugin should be solving your issue, please feel free to open up a new support topic with more information about your setup so that someone can help you debug.