I can't post any pic here. Every time i'm trying, i get nothing but infinite load with no any byte sent. According the dev tools, i get a HTTP 400 error.
I was able to upload a pic and post just fine on !paizuri (NSFW image) just a few minutes ago using the web client.
I have had it hang in the past, but I just usually visit catbox.moe and upload there and post the link when that happens. It's been a while since I've needed to do that though.