militools

Mili Localizer scans post content on publish and/or update. If it finds external image URLs, it downloads those images, uploads them to the Media Library, and replaces the original image URLs in the post content.
Key capabilities:
<ul>
<li>Import external <code><img></code> images.</li>
<li>Rewrite content image URLs to local uploads.</li>
<li>Preserve <code>alt</code> attributes in content.</li>
<li>Exclude specific domains from import.</li>
<li>Configure JPEG/WebP compression quality.</li>
<li>Optionally set first imported image as featured image if none exists.</li>
</ul>

Mili Localizer

Automatically imports external images from post content into the WordPress Media Library and rewrites image URLs.

daxiawp

Automatically keep the remote picture to the local, and automatically generate thumbnails.
自动保持远程图片到本地，并且自动生成缩略图。
详情：<a href="http://www.daxiawp.com/dx-auto-save-images.html" rel="nofollow ugc">http://www.daxiawp.com/dx-auto-save-images.html</a>
<h3>Arbitrary section 1</h3>

DX-auto-save-images

Automatically keep the remote picture to the local, and automatically generate thumbnails.自动保持远程图片到本地，并且自动生成缩略图。

Mili Localizer vs DX-auto-save-images