Adding external images to posts or custom post types
External Images work everywhere that allows featured images and/or galleries. Note that not all post types have ‘gallery support’ enabled, so in those cases the gallery box will not appear.
The image URL you paste is stored in the external_image_url custom meta field and served straight from its original host. WordPress never downloads the file or generates the usual set of resized copies, so there is nothing sitting in your uploads folder to back up or move.
If you are setting up your first image, the External Images Quick Start Guide walks through the whole flow end to end.
Adding an external featured image
To add a featured image, paste the URL into the top box in the Image URL box under the ‘External Images’ heading.
Deleting your external image
To delete the external featured image, click ‘Remove Image’ under the ‘External Images’ section:
Adding a gallery to a post/custom post
In compatible post types that support galleries, you’ll find an additional box. You can enter the image URLs into this box, hit ‘Preview Image’ and that extra image will be added to your gallery.
Deleting images from the gallery
When you hover over the images in the External Images Gallery section, a red cross will appear allowing you to delete images from the gallery.
If the gallery box does not appear on a custom post type, that post type has not declared gallery support. Featured images still work regardless. Adding gallery support is a one-line theme or plugin change against add_post_type_support().
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