How to reference existing Paragraph entity? I'm trying to create an entity reference field for existing paragraph, but can't seem to figure it out. 

I've tried creating a normal entity reference field (content) but that only gives me the options to select from content types. 

I've tried creating a paragraph field and using a entity reference view to display the results. (this displays a list of paragraph entity ids but when referencing one in a node it comes up with There are no entities matching "(21)".

How do I reference existing paragraph entities in a node?
Re-using paragraphs is not supported/allowed. Each paragraph has a reference to the host entity it is being used in and only supports one such reference.

If you need re-usable content in paragraphs, you need to have another entity type or bundle that you reference from a paragraph type.