Email Assets
Upload Email Asset
Uploads an image (multipart field `file`: PNG, JPG, GIF or WEBP, max 2 MB) and returns its public URL to use in a template body or as the layout logo.
Delete Email Asset
Deletes an image and its file. Blocked with 422 `asset_in_use` ('Used in 3 templates and 1 brand layout — remove it there first.') while any template body or brand layout (HTML or quick settings) still shows it.