How to make a image url active in Views Table
I assume that this is a file field and that you chose URL to File as the field formatter. You would then need to scroll down and expand Rewrite results, tick the box for Output this field as a link, and in the box for Link path you need to enter the views token replacement for your field name, which you can find by expanding the section below titled Replacement patterns—in your case it is likely to be [field_scan]

Once you enter that, you should have what you are calling "active link" which in more precise terms would be called an hyperlink or anchor tag.