When posting photographs I do it basically the old way. I type in the Quick Reply box and then hit Go Advanced. From there I manage my attachments. Because I use a digital camera and not a smart phone I have to transfer the photos over and reduce the file size before I can post, so they are already in my Downloads.
When the attachment box pops up, it is defaulted into the old vertical layout (at least for me, Firefox user). I have to manually change the window to a horizontal layout where the actual attach file button is on the far right. It took me a surprisingly long time to figure out just to spread out the window.
Once I do it, it stays for the rest of the day but resets the next. I'll have to do some timing stuff to see if it defaults every time I'm logged out (I never stay logged in on a site if I am not actually sitting at my keyboard). I don't always post pictures every time I'm on!