If you are trying to save pages from the link:
And you want to save the filename with the number mentioned in the URL, you can use the following method:
Test (3) (2).xaml (31.7 KB)
For this, if you click the activity and select right side mouse button under input in properties in order to save image, the image is saved as download.jpeg. So, if that makes a perfect saving choice go for it otherwise you can use the above given link: Test (3) (2).xaml (31.7 KB) and it will help you to save the image with the number or letter added in the URL; for example, x.jpeg.