When an item has a SharePoint folder created for it using one of the following automations or workflows:
…we normally suggest also using the Secure Embed item view to interact with the files in the SharePoint folder.
It is however also possible to add a link to the configured folder in a column of type Link for the item.
To use this workflow action, we recommend adding it to the end of a workflow — for example after the Create folder for item in SharePoint workflow action.

How the workflow works
Here's a walkthrough video to show how the workflow feature works.
Start at 01:54 for the "Link to configured SharePoint folder" part: