Install Postly for your Slack workspace
Start in Postly's Channels page, choose Slack, and authorize the app for the intended workspace. Your Slack administrator may need to approve the installation. Invite Postly to the channels you want it to use.
Open Slack connection setupSlack Marketplace listing planned
Postly is not currently listed in Slack Marketplace. Direct installation and a Marketplace listing are separate: a Marketplace link will be added here after Slack approves the listing.
Installation allows Postly to send messages and files and find channels it can access. It does not grant message-history access. You can remove Postly from your workspace in Slack's app settings.