1- Gmail advanced search
As you know Gmail advanced search settings allows you to conduct highly targeted email searches. You can search for emails that contain specific words, from/to specific individuals, sent within a given period of time and many more. You can also use Gmail advanced search settings to search for emails that include attachments. Here is how to access this feature: once in your Gmail account, click on the drop-down menu in Gmail search bar:
Check the box which says ‘Has attachment’ then click on search button. You can refine your search by typing specific info in the other boxes as well.