islacker

在发布文章中，如果文章中引用了远程图片，那么之前的做法就是：下载这个远程图片，然后重新上传。 
有了这个插件，你就可以省掉这些工作了，插件会在提交的时候，检查文章中引用的图片，如果是远程图片，就自动下载到附件目录，并保存到媒体库。 
如果没有选择特色图片，会自动选择第一张下载的图片作为特色图片。

Sync Remote Images

这个一个能在发布文章时同步文章中的远程图片的插件。

Atakan Au

By default, adding an image to the WordPress media library requires you to import or upload the image to the WordPress site, which means there must be a copy of the image file stored in the site. This plugin enables you to add an image stored in an external site to the media library by just reading list of remote images using CDN service’s (Cloudinary) API. In this way you can host the images in a dedicated server other than the WordPress site, and still be able to show them by various gallery plugins which only take images from the media library.
The plugin provides a dedicated ‘Media’ -> ‘Import images’ submenu page.
Supported CDN services: 
* Cloudinary 
(others coming soon)
<a href="https://atakanau.blogspot.com/2020/10/import-cdn-remote-images-wp-plugin.html?utm_content=textlink&utm_medium=link&utm_source=wporg&utm_campaign=import-cdn-remote-images-desc" rel="nofollow ugc">Blog and feedback</a>
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Import CDN-Remote Images

Add external images to the media library without importing, i.e. uploading them to your WordPress site.

Sync Remote Images vs Import CDN-Remote Images