Adding photo to person's database

Can’t seem to figure out how to add a photo to a person. Have a photo in media collection, but can’t connect it to the person. I tagged the person, but photo still doesn’t appear.

Have you marked it as the “primary photo”?

Yes. Now, maybe the photo is in place. I didn’t go to the person immediately. I’ll recheck and reply.

Checked the person just now. Had to re-tag person. Re-checked as primary. Photo is in place! Many thanks! Must practice with more photos for others.