update readme

readme.md

@@ -6,11 +6,11 @@ BU Media S3 is a WordPress plugin designed to work with the [Human Made S3 Uploa
 
 - **S3 Upload Directory**: The plugin filters the `upload_dir` hook and rewrites the values in a way that is compatible with the S3 Uploads plugin and the BU Protected S3 Object Lambda stack, redirecting all media uploads to the S3 bucket. It also changes the default upload location from `wp-content/uploads` to `files`, which is the convention for BU WordPress sites.
 
-- **Prevent Image Scaling**: By default, WordPress generates a scaled derivative for every image size that is defined for the current site. Because the BU Protected S3 Object Lambda stack handles image resizing automatically, the WordPress media library only needs to handle the full sized original upload. This plugin tells WordPress not to generate any derivative sizes on upload. It preserves the attachment metadata for all of the defined sizes by generating it directly during the upload process.
+- **Prevent Image Scaling**: By default, WordPress generates scaled derivatives for every image size defined for the current site. This plugin sets a custom filter flag during the upload process and uses it to interpose a custom Image Editor object. This approach leverages the technique used by the S3 Uploads plugin, ensuring that the core WordPress image size metadata generation remains intact while skipping the actual resizing. This allows the BU Protected S3 Object Lambda stack to handle image resizing automatically, and preserves the attachment metadata for all defined sizes.
 
-- **Suppress Big Image Threshold Resizing**: WordPress 5.3 introduced a new feature that automatically resizes images for "web-ready" dimensions. This plugin suppresses this feature, allowing you to upload images at their full size.
+- **Suppress Big Image Threshold Resizing**: WordPress 5.3 introduced a feature that automatically resizes images to "web-ready" dimensions. This plugin suppresses this feature, allowing you to upload images at their full size.
 
-- **DynamoDB Crop Data**: This plugin provides a way to write crop data to DynamoDB. The BU Protected S3 Object Lambda stack can read this crop data and apply it when the image is requested. The site-manager plugin automatically writes crop data to DynamoDB when a sites are moved or cloned.  I'm not sure about site creation though, that might be a todo.
+- **DynamoDB Crop Data**: This plugin provides a way to write crop data to DynamoDB. The BU Protected S3 Object Lambda stack can read this crop data and apply it when the image is requested. The site-manager plugin automatically writes crop data to DynamoDB when sites are moved or cloned. Site creation might be a todo.
 
 - **Handle Site File Deletion**: When a site is deleted, this plugin handles the deletion of files from S3 and the corresponding crop data in DynamoDB. It deletes both the original and derivative images from S3.