To attach a file, you can either drag and drop the file onto the item detail view, or click "Attach files" and select a file. There is no restriction on the file type. 

Note 📝: You can only add an attachment to an open item. 

To view a file, click into it and you will be able to view the preview and all associated details of the item.

To attach a link to an item, you can enter the link in the comments section or click "Add Link".  

Edit the display text or URL of the link by hovering over the attached link and clicking on the "Edit" icon. ✏️ 

To view a link within Hypercontext workspace, just click on the link preview under Attachments.

If you'd like to view it in a separate tab from workspace, just click the expand icon.