It's a permission setting in our forum software (currently set to Off). I'm not Teapot but it is likely because some attachments can be chunky and we would have a view of all of them in the backend (and on the server) to keep an eye on usage, which has implications if you guys want to start sending one another saucy pictures in your private conversations. This way keeps private conversations more private, if that makes sense.
Lol. I just wanted to send some pics of some blu-rays I’m trading that not everybody needs to see, but I guess I’ll try and get back into my imgur account... How many apps and login details does the world need, stick my neuralink in already.