Their is a gallery button just above the search button. Set up and upload your photo their. I've managed to post one several weeks ago but today all I could do was post the link to the photo.
Yes, it seems to be quite difficult to do anything but type one post a message....even then I have to fight spell check.....
Just noticed the add image to post button is back for me.
Oops - my Add Picture is gone again!!
When you click on the heart, it goes to a HTML page, just hit the arrow to "go back", and you have clicked on the heart. You won't see it has been done, but it has. If you "refresh" the page, you can see it worked.