Card Covers: Show attachments on closed cards
With this convenient power-up, you can showcase your graphics and create a gallery on your cards in just a few clicks. To show your attached images on card fronts, enable the Card Covers power-up in board Settings.
You can select any of your graphic files or pdf to become a card cover or covers - marking multiple files with the eye icon will create a gallery on your card.
Furthermore, any of your file attachments (e.g., .docx, .xlsx), or Web Attachments can be pinned to the card front. While it won’t give a preview, it will make your files accessible directly from the closed card, ready for a quick download.