Create a new path for an element

A user must be able to add a new "link" to an element (that's just adding a new path):

Element X must also be present in folder Y

Fortunately, we already have an endpoint to do that CreateElementParent !

A new action on an element (normal or folder) should be available on its detail page: + Add link

When clicked, this new button should open a modal displaying a tree of folders in the corpus, with the current element highlighted (bonus).

A user should be able to select any folder, and simply click a submission button to create a new path.