Thanks for you reply.
I'm a newbie, so I may seem a bit dense.
The gallery shows an array of recent photos. Before I bring up the photo that I want, it shows 3 icons. One is for search. I don't know how to describe the other 2 icons. At the right of the 3 icons are the vertical 3 dots. I selected the one that I want to add the description to and then did several more gestures that I have now forgotten but it did give me the opportunity to add a title and a description. I did that and saved it. I bring it back up and the title and description are there, but the description is in a tiny font, way to small to read.
I appreciate you getting me this far, but if you can help me further:1) take a guess at what the several more gestures that I have now forgotten were;2) explain whether I can change the text font.
I'm using a Samsung Note10+ phone and I think the Gallery app is the one that was pre-loaded.