In Photos, how does one name a particular photo? I do not want the meta data or to overlay the photo, just a simple custom title below the photo.

I have been unsuccessful in resolving this issue even though it seems it should be an easy task. What am I missing, or do I need some third party app, if so,have you suggestions?

Harv
27" i7 iMac (10.13.6), iPhone Xs Max (12.1)

Those who can make you believe absurdities can make you commit atrocities. ~Voltaire