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The Slack `upload-file` action accepts `media` as an alias for `filePath`, so a caller can reach it with the same vocabulary used for a media `send`. That vocabulary carries its accompanying text in `caption`, but the upload path read only `initialComment` and `message`, so the text was dropped and the file arrived in the channel with no comment at all. Accept `caption` as the lowest-precedence alias. Explicit `initialComment` still wins, `message` still comes next, and an explicitly empty higher-precedence value stays empty.
OpenClaw Slack
Official OpenClaw channel plugin for Slack channels, DMs, commands, and app events.
Install from OpenClaw:
openclaw plugins install @openclaw/slack
Configure the Slack app credentials and allowed workspaces/channels in OpenClaw. The plugin lets agents receive Slack events and reply through the configured Slack app.