I will follow up with this to say @passenger is correct, we are currently relying on third-party image hosts for posting images here; however, I am looking into the possibility of using my own server as a means to allow hosting here on OT as a sort of CDN (content delivery network) so that images will load from there and not affect the server load for OT's actual server. That's not available quite yet, and research is still being done on that, but ideally we'll have that ready sometime soon so OT will be able to allow for attachments in posts like most other forums 
