masino_sinaga and pstuder - Did either of you figure out what is causing this? I'm on v1.16.3 and have run into the exact same issue (my users are unable to add attachments). Agents can add attachments fine. I know it's not a permission issue on the server because I'm an agent and can add attachments while replying to a post. If I log in as a normal user with the same account as my agent, I can't add attachments.
