For me personally I always get that the file of the picture is too large and exceeds 2000 bytes when I try to use the "Share Photos" link... don't know any picture that is 2000 bytes, but whatever... so I had to use a 3rd party upload website so that I can get the
HTML:
script to directly put in the thread text area and I can share photos that way.
Now I may have misunderstood but are you talking about in-game message and forums or out of game messages and forums?
I am talking in-game. You can use the LINK to add a report to a message or post, and you can use the Spoiler to add text to a spoiler box, but I can't figure out how to combine the two.