put https://api.shift.io/v4/sync/links/
Updates an existing link
This call lets you update the contents or settings of an existing link. The link id is a required parameter. A successful update returns a 204 code.
When you update a link, make sure you enter asset ids; otherwise, the link will be empty. For example, if you update the link title but do not pass in the asset ids, the title will be updated but the link will not contain any assets. Similarly, if you want to add assets to a link, be sure to list both the original assets and the new ones.