no issue
- use `URL.createObjectURL(file)` to get a blob url rather than using `FileReader.readAsDataURL` which generates a very large data attribute
- speeds up the display of previews and associated browser hangs when an upload finishes, especially noticeable with large images and fast connections where multiple uploads finish around the same time
closes https://github.com/TryGhost/Ghost/issues/9840
- added error on uploading an invalid image format
- updated to use overall error method(`onFailed`) to set error message instead of individual upload failures(`onUploadFailure`)
no issue
- added `onUploadStart` action to `{{gh-uploader}}` that is triggered when individual files start uploading
- will not be triggered for any files that fail client-side validation
- changed `{{koenig-card-gallery}}` to only add images to the local gallery display when the uploader starts an upload
no issue
- moved all payload building into single function
- only put fully valid images into mobiledoc
- extracted image data reading and width/height reading into a separate function
- fixed re-ordering when deleting an image
