To ensure the communication related to the board work is clear, it might be necessary to refer to a specific article or link in the cards.
Add links (URLs)
This is possible in Placker by double-clicking a card and then clicking the button "Attach URL to card". The same button can be found when you single-click and use the panel on your right.
Then, add the link, or URL, and a title to that URL. It will now be shown whenever you access this card.
Other interesting feature is to add a file, for example an image. To do this, open the folder in which the file is located, click and drag over the card. When you drop the mouse, it will be automatically updated.
Attachments in Trello
The files you upload with Placker will also be available in Trello, in case your board is connected to Trello.