I'm sure there's an easier way of doing, but I open up 2 browser windows: 1) w/ message I want to post and 2) with album of pictures I want to use.
When you click on picture, you will get a URL. Copy & paste into message using the "insert photo" icon. (little box w/ mountains & moon" You'll see when you click on picture icon it asks for URL. You have to do one at a time. A little time consuming but I don't post pics very often. Hopefully someone may have already given you an easier way.
Great to meet you & Dakota. You have a gorgeous daughter and she looks great in the pictures with our car! Hope to get together again soon!