Photo Name Change

I have a wordpress website that has photos uploaded. I wanted to change the file names and downloaded Media File Namer Pro. However, on the website the photos have a name under them. That name didn’t change even though I renamed the file. How can I edit the name that appears under the photo?
Theme: Optimizer
I used WooCommerce and added products and have gone into WooCommerce Product Descriptions and changed that as well.

Go to Gallery, Home – The first photo name is: Arches National Park Utah 2015.1 — However, that is not what appears under the photo.

How do I get the name under the photo to change the file name?

• This topic was modified 7 years, 3 months ago by momcherylfox.

The page I need help with: [log in to see the link]