Hold your mouse on the image you want to save, and press s key on your keyboard.
How do I customize the filename?
Edit this script in your script manager.
Modify FORMAT.single and FORMAT.multiple functions。
The single is used for single image, and it takes one argument d representing the metadata of this illustration, which can be used to construct the filename you want. The multiple one is similar to single, but it will be used when there is more than one image. It takes 2 arguments d and i, and the latter represent the index of the illustrations (start from 0).
The following block is an example of d metadata object: