I am unable to add existing testimonials to a group this way:
Testimonials>Edit>Highlight Group(s)>Save Testimonial
When I do this I get a message "Your update has been saved," but when I return to the Testimonials list the group does not appear.
I am able to save them this way, but it is time-consuming for adding a testimonial to multiple groups:
Groups>Click on Group ID>Check boxes of testimonials I wish to add>Save Group