The Slack integration allows you to share files and message people in Slack directly from a file in Dropbox.
You can see who shared your file in Slack, when they shared it, and what channels they shared it in. This information will appear in the Activity section of your file’s preview.
To connect Slack to your Dropbox account:
You can also connect from Slack by adding The Dropbox app to your workspace.
To share a Dropbox file in Slack on dropbox.com:
A link to the file will appear in the Slack channel you chose or in a direct message to the person you sent it to.
You can message someone you're sharing a file with in Slack directly from a Dropbox file preview. To do so on dropbox.com:
You can also click the downward-arrow and Slack to share the file in a direct message with that person.
To disconnect Slack from your Dropbox account: