Posting a Message to Slack
Describing auto-step to post messages /upload files to Slack.
Slack Web API
Slack: Chat, Post Block
Posts a message in block format. A table data can be attached as needed. It is also possible to change to an ephemeral message that is displayed only to a specific user.
Slack: Chat Post Ephemeral
Sends an ephemeral message, which is visible only to the assigned user in a specific public channel, private channel, or private conversation. The user should be in the channel specified. SLACK USER is ID of the user who will receive the message.
Slack: Files Upload
Uploads files. If you want to share files, specify a comma separated list of channel names or IDs in SLACK CHANNELs.
Slack: Chat Post
Sends a message to a channel. SLACK CHANNEL can be an encoded ID, or a name for channel, private group, or IM channel to send message to.