In a list, you can filter by a certain relationship. However, if you embed a list in a doc, there is no option to filter in the same way, by relationship. The option simply doesn't show. It would be great to have that functionality in Docs. Our use case is that we want to a doc that is say a campaign summary and includes views of tasks from different departmental lists in the workspace filtered to show only tasks relevant to that campaign. 1st screenshot is from a list, showing the relationships as options to filter by. 2nd screenshot is in a doc, where the filter does not show relationships as an option. (ps. I guess a few other types of fields also dont work to filter by in the embedded list too)