To have the right to relate content you obviously have to have access, but you also have to meet one of the following conditions:
be the author of this content
have the right of "contributor" to the space or more
have the right of system "coordinator" or more
It would be an advantage for certain contents (for example a main document and its annexes which would consist of different files) to be related. Indeed, it is meant to encourage readers to further deepen a subject.
Content can be related to other content and be presented as reference on the right-hand side of the linked content. Related contents are bidirectional.
How do you relate contents?
Click on "Edit" in the upper right corner of your Story
Go to the metadata area at the bottom of the Story
Click on "Add a Story" and use the search to link the desired content.
Or use the "Draft" or "Bookmarks" function to link the content with a selection of content from your Bookmarks or your drafts.
Another way to present related content is to combine them in a Story. The system puts them in the body of the Story but also in the related content at the bottom of the Story
How do I delete related content?
Click on "Edit" your content.
Go to the metadata area at the bottom of your content
Click on "Add story"
In the window that opens, you see your different related contents and you can click on the cross to delete them.