How to label or title individual photos
I notice when I receive individual photos from friends, underneath the thumbnail is a text such as "Grandpa, 1975" or "Vacation-Grand Canyon 1987". I have laboriously titled all my thousands of photos (within Photos), but when I send individual photos to friends they typically show under the photo, "IMG_7400.jpeg" ... only occasionally does the title show under individual photos I send. What do I need to do to get my titles to automatically appear under individual photo thumbnails I send?
Thank you,
HDP
iMac: Mojave 10.14.2
Photos 4.0
iMac Line (2012 and Later)