How to enable icon for your attachment instead of the download button?

Though you can leave the radio button ‘Download’ selected in the Show Attachments File Icon / Download Button’ option in Settings > Setting, 

if you want to enable an icon for your attachments, you can choose the ‘Upload icon’ option and upload an image file for the same.

Key Benefit

To customize your store’s look or to add a self-explanatory image for your attachment, using an icon image could be a nice idea.

It will improve your store’s look and drag buyer’s attention towards the attachment faster