Properties tab of the folder's settings panel. Here you can select a template and configure default values for each custom attribute, click on Save to confirm the modifications. Whenever someone insert a new document, its metadata will be pre-filled...
right-click on a target document and select Paste as link. Now you can see the new link appearing in the Links tab. The attribute Type can be used to better qualify the link, and you can change it inline by double-clicking on the cell. As usual, a...