For what it’s worth Slack do publish some [Slack URL scheme information](https://api.slack.com/docs/deep-linking], but I don’t see anything in there about posting. Just jumping into the app and opening things up.
For what it’s worth Slack do publish some [Slack URL scheme information](https://api.slack.com/docs/deep-linking], but I don’t see anything in there about posting. Just jumping into the app and opening things up.