How to set attachment action
WooCommerce Product Attachment Plugin lets set Attachments Action as a download or view in the browser.
For this, you must choose the right radio button in the Settings > Attachment Setting section related to the same.
If you want that your customer can view the product attachment in the browser instead of downloading it then you can use this feature and set the Attachment Action as a View.
In another case, you can set the Attachment Action as a Download to download the attachment at the click of the button.
Screenshot - 1: (Attachments action settings)
Video - 1: (Attachments action's demo)