The official documentation states that it can be added using the attachment icon (clip symbol), but it does not appear.
I am doing this as the PDI administrator user and have no lack of user rights.
I am looking for a way to attach it to a record, not to a ‘version’ of the related list.
Also, I have just created the PDI and have not customised the relevant sections.
(I've even added the Managed Documents plugin)
