To view many of these files, an installed program on your device is needed.
New phones and tablets cannot extract zip files.
FREE Graphics Editor paint.net
This program will allow you to prepare photos and graphics for your Local U3A Home Page. Cropping is usually needed.
Look at this trusted www.ninite.com > site under imaging.
If help is needed, Google for paint.net tutorials. There are other Graphics Editors out there.
Take care some free programs sometimes leave adware.