The particular option should be enabled to apply the featured image. See the picture below.
The featured image can be specified only by adding extended attribute in the document named ‘featured_image’ or ‘Featured Image’.
The attribute’s value can be:
- The physical URL of the existing WordPress media picture (marked as link or not) or inserted linked image with that URL. The plugin detects that picture URL is the media picture and set it as featured image. To obtain this URL, we should go to the particular image in the Media Library, click on ‘Edit’ and look at ‘File URL’ property.
- Embedded or linked image as similar to body image. In this case the image will be automatically uploaded and set as featured image.
Note: The image is always placed in the media library.