You can load up to four photos in each posting.
When you click "additional Options" and then "Attach" and 'choose a file' you then attach one photo.
Then key (more attachments) and it then allows you to go through the same process and attach a second then again go through the same process up to four photos.
The size of each photo for upload is limited to 1024KB per each.
Ideally the photo size should be around 3 -400 KB so that when someone clicks on the picture it increases to a reasonable size but not too big that you have to navigate around the photo to see it all.