When opening an email photo, then using the arrow button to scroll through, where do the other pics come from?

My daugher sent me email photos. I opened the photos and hit the arrow button. Other photo appeared that seemed to be attachments like the advertising links that pop up from time to time. Is that what those photos are? Also, when sending someone else photos can any images from your PC automatically attach. (What can I say, I'm older and not computer savvy). Thanks

When opening an email photo, then using the arrow button to scroll through, where do the other pics come from?
When scrolling you can see that it is in Temporary Internet Files your attachments is saved, together with a lot of other files from your surfings.
Reply:These are images that you have browsed at some stage,and no images from your computer will not be viewable by other users.