@Garry Edwards The simplest way to share images is to open them up on your computer then choose share screen and select the window with the image. All the participants then see the image filling their screen.
Thanks for that this evening, apologies, I had to shoot off as my little one was shouting for a cuddle before going to sleep. It was great to hear some ideas and tips on how to improve things,. I'll be back again in future if you are able to do some more
Yes, it's just a setting that I didn't know was there until half way through. It had a "share screen" button on mine and I wrongly assumed that everyone else had one too. After a while I accidentally discovered that it was set to host only, which I then changed so that everyone had it.