I was having a problem with attachments using the chat.postMessage API. Working backwards, I tried using the Tester to send something with an attachment. But even using the tester, I'm not getting anything. Now I'm stumped.
Using the Tester with chat.postMessage, I'm including the following fields:
token: ... channel: #general text: test attachments: [{title: '2nd test'}]
But all I'm getting in Slack is "test" with no attachment.