Saving Ad Pics
I can't say about other browers. Firefox (desktop or laptop) has an easy way to save pics from eBay and Facebook and whichever other platforms work similarly. It sounds like a lot of steps but isn't when one gets a grip on the procedure.
Click on the first photo to view it larger (overlay), right-click on the image and select Open Image in New Tab, which it will. Proceed to do that with each photo. Then switch to each tab in turn and either right-click and Save Image As or drag the image to wherever you wish to save it, such as a folder on the desktop or wherever you can find it when finished. Sometimes all the images are fed as the same filename so renaming each (such as 01, 02, 03, etc.) before saving the next can make for easier handling. You'll have all the images saved offline when done for dragging them into the post and submitting it, and can then delete the images and folder if not wanting to keep them.
Can also optionally edit them if you have software for that before adding to the post. Best size for display on AW is no more than 900 pixels on the largest dimension, I resize to 875 pixels. Sometimes I crop-out extraneous area and tweak the contrast and sharpness.
Some market platforms use page code to block right-clicking for saving the images but Firefox has a workaround that usually works, which I won't get into the details of it.
