It allows to replace the thumbnails that are auto generated by the resizer of WordPress.
Then you can create own thumbs, upload and replace them with the ones already generated by WordPress..
You can drag and drop the thumbnails that you want to replace using the interface provided by the plugin.
Two things you must take care while uploading the images is the size of the image and also the name of the 1.
The actual size of the image you created and the size you specified in the plugin must be the 2.
The filename of the image must be the same as the original fullsize image that you uploaded in the media gallery..
Since this plugin works by replacement adding of images, this means the original fullsize image must be available on the server and the filename that you are about to upload also must be same as the original image..
If it's not correct you can create your own thumbnail of 'myfile jpg and rename it as 'myfile jpg and upload the thumb by dragging it on the drag zone of the plugin.
Also do not forget to enter the actual size of the thumbnail on the input fields.
This size must be the same to the size of the thumbnail you want to replace to add..
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