You can define relationships between objects to link interrelated documents. By using relationships, you can define metadata connections between objects, just as via the metadata card. For example, you can link a customer with an object. The customer then also appears in the metadata of the object. Likewise, the relationships entered via the metadata card will appear in the Relationships dialog.
Does your M-Files look different? - This video features the previous user interface. This video will be updated shortly to feature the latest version of M-Files (released in November 2022). Please note that the lessons in this video still apply.