How can I filter a view by Content Type -or- Taxonomy Term and have both sets of items show? I have a basic view that works great. It shows a list of nodes that are filtered by content type.

To that list of allowed content types, I want to add a taxonomy term. That is, the view should show anything that is a certain special content type, but ALSO include any node that has a certain special taxonomy term, no matter what the content type is.

The view that already works fine has its filter setup this way:

FILTER CRITERIA: 

Content:  Content type (is one of: Blog, IM, PI)

Easy, no problem. To add the taxonomy term, I set it up this way:

FILTER CRITERIA


    Content:  Content type (is one of: Blog, IM, PI)  OR
    Content: Has taxonomy term (= News Release) | Settings


Here's where it went all wrong on me. As soon as I added the taxonomy term filter, the items that should be there by Content Type completely disappeared. Only items with the taxonomy term show up in the view now. If I remove the taxonomy term filter, then items in the Content type pop back in again. It's like the taxonomy filter suppresses the content type filter in some way.

I tried:


using Content: Resource Type (= News Release) | Settings which was an alternate way of listing the taxonomy, "Resource Type" being the vocabulary
using AND instead of OR but, as you would expect, that returned no results at all because I do not have any of the special three content types that are also labeled as the special taxonomy "News Item". They are separate use cases. 
using filter groups, listing the content type, an OR, and a content type AND taxonomy:

Content:  Content type (is one of: Blog, IM, PI)
OR
Content: Content type (= Article) AND
Content: Has taxonomy term (= News Release) | Settings



To be clear, either the node is a special content type OR the node is a regular content type with a special taxonomy term. Never both. Both types of nodes should appear side-by-side in this view.

Am I not allowed to make a view that shows stuff filtered by taxonomy alongside stuff filtered by content type at the same time? Can anyone suggest something for me to try?
For others Solution is adding a views relationship
see Documentation: https://www.drupal.org/docs/8/core/modules/views/add-a-relationship-to-a-view